Organisms belonging to which of the following classes have a four-chambered heart?
Class Aves
The correct answer is Class Aves.
Members of class Aves (birds) and class Mammalia possess a four-chambered heart — two atria and two ventricles — which completely separates oxygenated and deoxygenated blood. This double circulation supports the high metabolic rate needed for endothermy and, in birds, for flight.
Class Pisces (fish) have a two-chambered heart (one atrium, one ventricle). Class Amphibia have a three-chambered heart (two atria, one ventricle). Class Reptilia also have a three-chambered heart with a partially divided ventricle — except crocodiles, which have a four-chambered heart. Hence, among the given options, only Aves consistently shows a four-chambered heart.
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