Most reptiles have three-chambered hearts, but alligators and crocodiles have four-chambered hearts, just as birds and mammals do. This suggests that they are more closely related to birds than to other reptiles. Some scientists even hypothesize that crocodiles and alligators had warm-blooded ancestors. A four-chambered heart is more efficient because it keeps oxygenated and deoxygenated blood separate.
Alligators, crocodiles and other reptiles have 3-chambers to their hearts. So do amphibians, including frogs and toads and salamanders. The oxygenated and deoxygenated blood will mix in the ventricle because there is only one.
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