PrepTest 77, Section 3, Question 16
Researcher: Dinosaurs lack turbinates�nasal cavity bone structures in warm-blooded species that minimize water loss during breathing. According to some paleobiologists, this implies that all dinosaurs were cold-blooded. These paleobiologists must be mistaken, however, for fossil records show that some dinosaur species lived in Australia and Alaska, where temperatures drop below freezing. Only warm-blooded animals could survive such temperatures.
Researcher: Dinosaurs lack turbinates�nasal cavity bone structures in warm-blooded species that minimize water loss during breathing. According to some paleobiologists, this implies that all dinosaurs were cold-blooded. These paleobiologists must be mistaken, however, for fossil records show that some dinosaur species lived in Australia and Alaska, where temperatures drop below freezing. Only warm-blooded animals could survive such temperatures.
Researcher: Dinosaurs lack turbinates�nasal cavity bone structures in warm-blooded species that minimize water loss during breathing. According to some paleobiologists, this implies that all dinosaurs were cold-blooded. These paleobiologists must be mistaken, however, for fossil records show that some dinosaur species lived in Australia and Alaska, where temperatures drop below freezing. Only warm-blooded animals could survive such temperatures.
Researcher: Dinosaurs lack turbinates�nasal cavity bone structures in warm-blooded species that minimize water loss during breathing. According to some paleobiologists, this implies that all dinosaurs were cold-blooded. These paleobiologists must be mistaken, however, for fossil records show that some dinosaur species lived in Australia and Alaska, where temperatures drop below freezing. Only warm-blooded animals could survive such temperatures.
Which one of the following most accurately describes the role played in the researcher's argument by the claim that only warm-blooded animals could survive temperatures below freezing?
It is presented as a potential counterexample to the argument's main conclusion.
It is a premise offered in support of the argument's main conclusion.
It is presented as counterevidence to the paleobiologists' assertion that dinosaurs lack turbinates.
It is the argument's main conclusion.
It is an intermediate conclusion for which the claim that some dinosaur species lived in Australia and Alaska is offered as support.
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