A four-chambered heart is present in

mammals and reptiles

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birds and fishes

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mammals and amphibians

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birds, mammals and crocodile

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Solution

The correct option is D birds, mammals and crocodile
A four-chambered heart is a characteristic feature of all birds and mammals. Two auricles and two ventricles. Reptiles generally have a three-chambered heart. Crocodile is an exception as it has a four-chambered heart.
Amphibians have a three-chambered heart. Fishes have a two-chambered heart.

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