PT102.S3.Q9 > Question

SECTION 1 · rc

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SECTION 3 · lr

SECTION 4 · lr

The ornithologist concludes that Archeopteryx probably lived in trees. This is supported by an analogy to modern tree-dwelling birds, whose curved claws let them perch in trees. Archeopteryx also had curved claws, leading to the sub-conclusion that Archeopteryx must also have been able to perch in trees.

The ornithologist goes from evidence about Archeopteryx’s ability to perch in trees to a conclusion that Archeopteryx probably lived in trees. This requires assuming that Archeopteryx’s ability to perch in trees indicates Archeopteryx having actually spent time in trees.

Whether or not modern tree-dwelling birds directly descended from Archeopteryx isn’t relevant to whether Archeopteryx actually spent time in trees.

In other words, Archeopteryx truly spent time perching in trees, enabled by its curved claws. This is necessary to assume, because if Archeopteryx didn’t use its claws to perch in trees, then its claws don’t support the theory that it was tree-dwelling.

Whether or not curved claws are truly necessary to tree-dwelling birds is irrelevant to whether Archeopteryx’s curved claws support the theory that it lived in trees.

The ornithologist’s argument just concerns Archeopteryx’s behavior, so it’s totally irrelevant whether there were unknown earlier birdlike creatures.

Whether or not there’s other evidence of Archeopteryx living in trees isn’t relevant to whether the evidence of curved claws truly supports the ornithologist’s theory that Archeopteryx lived in trees.

PrepTest 102 - Section 3 - Question 9

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