PT106.S3.Q13 > Question

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Prehistoric birds had growth rings suggesting they were cold-blooded animals, but dense blood vessels suggesting they were warm-blooded animals.

A hypothesis resolving this dispute must state a key similarity or difference between prehistoric birds and either cold-blooded or warm-blooded animals. It must allow for prehistoric birds to have both growth rings and dense blood vessels while being exclusively either cold-blooded or warm-blooded.

This does not favor either possibility. Though other warm-blooded species descended from cold-blooded species, it is possible warm-blooded birds descended from warm-blooded prehistoric birds.

This is irrelevant information that does not favor either possibility. It is not stated whether prehistoric birds possessed any other traits of cold-blooded species.

In dispute is whether prehistoric birds were warm-blooded or cold-blooded, regardless of whether they were ancestors of modern birds. Both studies draw conclusions about prehistoric birds explicitly, so this does not favor either possibility.

This gets the desired relationship backward. It states that some warm-blooded species do not have dense blood vessels, but admits the possibility that all species with dense blood vessels are warm-blooded.

This suggests prehistoric birds were cold-blooded. It implies that dense blood vessels are not necessarily evidence of warm-bloodedness, especially among animals with growth rings, calling into question the conclusion of the second study.

PrepTest 106 - Section 3 - Question 13

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