New EST Practice four writing March 2026

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Paleoanthropology: The Study of Human Lineage

[1] The lineage of which we have to speak in the present chapter embraces all fossil and genetic evidence found anywhere, or at any time, beneath the earth’s surface or within its populations. Particular milestones in this deep history have, of course, their specialized nomenclature. Australopithecus afarensis, the poster-fossil for early bipedalism, is a form of hominin that has played a very[2] influential part in scientific narratives; hence the separate mention of “ape-men” in the heading of this chapter.

While there are many selective pressures that help to shape the arc of evolution, the most potent of them all is environmental change. Let us see what happens when a shifting climate alters the landscape of a tropical forest, for example. If the ecosystem transformed in a smooth, linear fashion over such a terrain, its pressure might nudge a species along a predictable path, but would not fracture a population into distinct branches. Such gradual adaptation, due to the consistent component of environmental stress, does, of course, occur, and its effects are strikingly visible in the incremental dental or postural changes observed in the fossil record. [3] These anatomical shifts clearly illustrate how steady pressure refines a species over eons. All environments in the ancient world were, however, full of volatility and catastrophe, and in many epochs, as during the rapid oscillations of the Pleistocene ice ages, there were strong selective shocks, sometimes extending to mass extinctions.

All species are bound by their genetic heritage,[4] and, contrary to a teleological view, never truly “strive” toward a predetermined form. Speciation may occur in isolated refugia, through the fragmentation of populations by rising seas, or it may be sparked by novel behavioral innovations, but a new hominin lineage emerges only because the ecological niche is changing with it; and, in a stable world, all species remain more or less static in their form. The rate of its evolutionary change depends upon the generation length, and upon the size and stability of the breeding population. [5] Other things being equal, the smallest, most pressured populations change most rapidly. Exceedingly large and widespread groups, even without intense selection to drive it, require hundreds of thousands of years to show significant morphological divergence from their ancestors.

Upward trends in cognitive complexity suffice to distinguish the genus Homo[6] uniquely every few million years, and migratory movements carry the same bands far and wide over the earth. The dispersal of populations by foot and raft leads to some results of remarkable interest, genetic as well as cultural. [7] In the first place, far-reaching differentiation in morphology and technology are brought about by this process.

[8] 1. Thus, in Indonesia, a distinct and diminutive hominin, Homo floresiensis, persisted in isolation long after its presumed ancestors had vanished elsewhere. 2. It is believed to have become adapted to the limited resources of its island environment. 3. Less extreme examples of this adaptive radiation are found on many other landmasses, including the whole of Eurasia for the Neanderthals. 4. Another effect of geographic dispersal is the hybridization of lineages. There is now clear evidence of genetic interchange between different hominin groups, so that the genome [9]of a particular ancient individual, [10]as a result, is not purely one species but a mosaic of several. Lastly, the presence of multiple, coeval hominin species in the atmosphere of competition, whether derived from a common ancestor or otherwise, had various profound and decisive effects upon the cognitive and social capacities we associate with modernity and modifies, in numerous ways, the conditions of human emergence upon [11]the planet.

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

Questions 12–23 are based on the following passage.

Markets, Plans, and the Promise of Fairness

Economic debates often treat capitalism and communism as two clean opposites: one celebrates markets, the other replaces them with planning. In practice, however, most societies combine features of both systems, adjusting the balance as conditions change. Still, the contrast matters because it highlights a central question: should prosperity be pursued primarily through competition, or primarily through coordination?

In a capitalist economy, productive resources are largely privately owned, and prices in competitive markets help signal what to produce and how much. When a good becomes scarce, rising prices tend to attract new suppliers, and when demand fades, falling prices encourage producers to shift elsewhere. (12) As a result, market systems can respond quickly to changing preferences, but they may also tolerate large gaps in income and access. (13) These gaps are not always signs of failure, yet they can become politically unstable when people conclude that effort no longer predicts reward.

Communist theory aims at the opposite problem: it seeks to reduce class conflict by placing major resources under collective control and distributing output according to social needs rather than private profit. Historically, communist systems have often relied on centralized planning, in which officials set production targets and allocate inputs. (14) Because planners cannot easily observe every local shortage and every local surplus, their decisions may lag behind reality, producing empty shelves in one place and waste in another.

(15) Nevertheless, comparing the two systems is most useful when the comparison avoids slogans. A market can generate wealth while failing to protect workers from risk; a plan can protect basic needs while discouraging innovation. (16) The deeper issue is incentives: if rewards are disconnected from performance, productivity may fall; if rewards are tied only to profit, essential services may be neglected. (17) A practical compromise is the mixed economy, in which private enterprise operates but government regulates certain markets and provides public goods.

When arguments grow heated, definitions also become slippery. Some speakers use “capitalism” to mean any society with inequality, and “communism” to mean any society with government programs. (18) This habit confuses discussion, because most modern countries are neither purely capitalist nor purely communist. (19) If the goal is clarity, the terms should describe ownership and decision-making: who controls investment, who sets priorities, and who bears the risk when a policy fails.

Finally, economic systems are judged not only by output but also by legitimacy. A society can produce abundant goods and still be unstable if citizens believe the rules are unfair. (20) Likewise, a society can promise equality and still provoke resentment if planners silence criticism or punish entrepreneurship. The strongest debates, therefore, ask a narrower question: which mix of markets and planning best fits a nation’s history, institutions, and values? (21)

(22) However, the lesson is modest but demanding: compare systems by outcomes and trade-offs, not by labels.  Only then can the discussion move from ideology to policy. (23)

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.

“Chimpanzees: Learning in the Forest”

Chimpanzees live in fission–fusion communities, meaning that the group can split into smaller parties and later reunite. Because members do not always travel together, information—such as where fruit is ripening—may spread unevenly. Still, some behaviors become shared traditions when young chimpanzees repeatedly watch skilled adults.

Tool use illustrates this process. In some forests, chimpanzees use thin sticks to “fish” termites from tunnels; in other regions, they crack nuts with stones. Researchers once assumed these differences were explained only by local resources, but evidence suggests that social learning also plays a role. For example, young chimpanzees often sit near a mother who is(24)  working, handling the same objects before they can use them successfully.

However, chimpanzees do not copy every detail. They may copy the goal—getting food—while inventing their own movements to achieve it. This focus on outcomes rather than exact actions (25)help explain why tools can look slightly different across groups.

Because traditions vary, researchers compare multiple communities instead of relying on one site. (26) However, the best way to study chimpanzee traditions are to examine several groups over time. Such comparisons help separate socially learned behaviors from individual discoveries.

To observe chimpanzees with minimal disturbance, researchers use remote cameras and audio recorders. (27) However the data still require careful interpretation, because a camera records only what passes in front of it and audio may not reveal the caller’s location.

When scientists use the word culture, they define it narrowly. (28) In this sense culture refers to learned behaviors that persist in a group over time, even as parties split and reunite. Protecting habitats may therefore protect traditions that exist only through repeated practice.

Long-term records make these patterns visible. (29) A typical chimpanzee can live for decades in the wild, though survival depends on disease and food supply. The oldest individuals we recognize are usually those followed through long-term field(30) projects; where researchers record births, deaths, and group membership changes. Such records, gathered over years, helps scientists test whether young chimpanzees learn mostly from mothers, peers,(31) and multiple adults. These findings matter because learning depends not only on ability but also on access: (32)a young chimpanzee cannot learn a technique that it never sees.

(33) Ultimately, careful definitions, careful punctuation, and careful comparisons allow researchers to argue that a behavior is cultural rather than accidental. (34) Studies that ignore these requirements may sound confident, but the claims they make is difficult to verify. (35) For this reason, strong research treats “culture” as a testable claim, not a slogan.