Are Dinosaurs Reptiles Or Mammals Birds and mammals have a four-chambered heart, with two ventricles and two ataria, but other …? modern reptiles have a three-chambered heart, with just one ventricle. Paleontologists debate whether dinosaurs had a typical “reptile-like” heart or “birdlike” heart. Long-necked sauropod dinosaurs could have had unusual circulatory demands because their head [...]
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