GMAT Practice Question Set #8 (Question 22-24)

Critical Reasoning Question #22: Eating with Opposable Thumb  
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The collection of fingers along with an opposable thumb in mammals including homo sapiens, lemurs, orangutans, and pandas, serve to enable the mammal to grasp external food and bring it to the mammal's mouth. These mammals rarely, if ever, eat food directly with their mouths without using their hands and the dexterity provided by having an opposable finger or thumb. Thus paleontologists' recent discovery that the bird-like theropod dinosaur Bambiraptor had a similar limb feature (opposable first and third finger) provides evidence for the hypothesis that Bambiraptor ate by bringing food to its mouth, not just by directly eating with its mouth.

In the passage, the author develops the argument by


forming the hypothesis that best explains several apparently conflicting pieces of evidence


reinterpreting evidence that had been used to support an earlier theory


using an analogy with a known phenomenon to draw a conclusion about an unknown phenomenon


speculating about how structures observed in present-day creatures might have developed from similar structures in creatures now extinct


pointing out differences in the physiological demands that flight makes on large, as opposed to small, creatures

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