AndyNeedsGMAT wrote:
retro wrote:
Explanation given in thebook:
Answer: A. This is an assumption question. Its conclusion and premises are:
Premises: (1) Ancient reptiles developed feathers as a way to insulate their bodies from the cold and regulate their body temperatures. (2) Many of these early feathered reptiles were unable to fly.
Conclusion: Today’s flightless birds probably developed their feathers as a way to manage their body temperatures.
This argument uses the fact that many early feathered reptiles were unable to fly to conclude that flightless birds developed their feathers for the same reason. But it must be assuming that the feathers did not develop for some other reason. Perhaps the feathers developed first for flight, but the birds eventually lost that ability. Choice A correctly states the assumption of the argument because it indicates that the flightless birds did not develop the feathers for an ability that they now no longer have. Choice B does not address the link between the feathers of flightless birds and the feathers of reptiles. Choice C doesn’t deal with flightless birds at all, so it cannot be correct. Choice D may be true, but it is not an assumption of the argument. The argument is only concluding why the flightless birds developed their feathers, not where they came from. Choice E is new information and not part of the argument.
Answer: A. This is an assumption question. Its conclusion and premises are:
Premises: (1) Ancient reptiles developed feathers as a way to insulate their bodies from the cold and regulate their body temperatures. (2) Many of these early feathered reptiles were unable to fly.
Conclusion: Today’s flightless birds probably developed their feathers as a way to manage their body temperatures.
This argument uses the fact that many early feathered reptiles were unable to fly to conclude that flightless birds developed their feathers for the same reason. But it must be assuming that the feathers did not develop for some other reason. Perhaps the feathers developed first for flight, but the birds eventually lost that ability. Choice A correctly states the assumption of the argument because it indicates that the flightless birds did not develop the feathers for an ability that they now no longer have. Choice B does not address the link between the feathers of flightless birds and the feathers of reptiles. Choice C doesn’t deal with flightless birds at all, so it cannot be correct. Choice D may be true, but it is not an assumption of the argument. The argument is only concluding why the flightless birds developed their feathers, not where they came from. Choice E is new information and not part of the argument.
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