____________ are the first kind of organisms to have a four chambered heart.

Reptiles

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Birds

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Mammals

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Pisces

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Solution

The correct option is B Birds
Reptiles have three chambered heart, with an exception of crocodile, which has a four chambered heart. But birds are the first organisms to have completely four chambered heart without any mixing of oxygenated and deoxygenated blood.

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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

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