Stimulus
Body temperature can be estimated by the relative proportion of two oxygen isotopes in bone. Such estimates derived from dinosaur fossils suggest that dinosaurs had nearly the same body temperature in their limbs as in the rest of their bodies. Typically, the core body temperature of cold-blooded temperature in their limbs. Thus, dinosaurs were probably warm-blooded.
What this question is testing
Your task
Find the choice that makes the argument's conclusion less likely to be true.
Common trap
Answers that look negative but attack a claim the argument never relied on.
Winning move
Find the assumption the argument depends on, then pick the choice that undermines it.
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