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Biology

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Reptiles do not live in the Arctic; however, some birds do, even though they evolved from reptiles. In your own words, offer an explanation for this fact. Include information on the metabolic differences between the two groups' bodies, as well as what effect their metabolic differences have on their relationship with their environment.
I can answer the metabolic differences part on my own, but I don't understand the first part very well.

  • Biology -

    The metabolic differences are the answer. Birds are endothermic, while reptile are ectothermic.

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