______ are warm-blooded animals with a four-chambered heart.
Mammals
Mammals are warm-blooded (endothermic) vertebrates that maintain a constant internal body temperature independent of the environment.
Their heart is four-chambered — two atria and two ventricles — which keeps oxygenated blood from the lungs completely separate from the deoxygenated blood returning from the body, enabling efficient oxygen transport.
Fish and amphibians have a two- or three-chambered heart and are cold-blooded; reptiles (except crocodiles) also have a three-chambered heart and are cold-blooded. Only mammals and birds are truly warm-blooded, but among the given options only mammals fit.
Hence, Mammals.
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