Remember the interlocutor who claimed that an animal is either warm-blooded OR cold-blooded and that a different metabolic rate couldn’t have evolved? Well, it seems we have proof that it did evolve. That or God changed his mind on the matter for some groups of animals.
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Dinosaurs Started Out Hot, Then Some of Them Turned Cold
Scientists directly measured the metabolic rate of extinct animals, which revealed that some giant dinosaurs became coldblooded.