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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Similar questions

Which one of the following sets of animals share a four chambered heart?

(a) Amphibian, Reptiles, Birds

(b) Crocodiles, Birds, Mammals

(d) Lizards, Mammals, Birds

Assertion: Bats and whales are classified as mammals.
Reason: Bats and whales have a four-chambered heart.

\begin{matrix} (i) A m p h i b i a n s a n d m o s t r e p t i l e s & A . 2 - c h a m b e r e d h e a r t (i i) B i r d s a n d m a m m a l s & B . 3 - c h a m b e r e d h e a r t (i i i) F i s h & C .4 - c h a m b e r e d h e a r t \end{matrix}

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