Which of the following has a 3-chambered heart?

Salamander

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Fish

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Crocodile

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Dolphin

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Solution

The correct option is A Salamander
Vertebrates have evolved a muscular heart to pump blood to body parts. Fishes have a two-chambered heart. Birds and mammals have four-chambered hearts, having two atria and two ventricles. Reptiles, except crocodile, have a three-chambered heart. Crocodiles have a four-chambered heart. Thus Dolphin being a mammal has a four-chambered heart. Salamander being an amphibian has a three-chambered heart.

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