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Question

Majorly the heart is four chambered in

A
Amphibia
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B
Fishes
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C
Mammals
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D
Reptiles
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Solution

The correct option is C Mammals
During the development of heart in higher vertebrates like birds and mammals, it initially exhibits the 2- chambered states same as fishes. Later on, it develops into 3 chambered as in amphibians and reptiles and finally in the last embryonic stages it becomes 4 chambered as such in the adults. This proves that all vertebrates have evolved from common fish like ancestors and also that both birds and mammals evolved from reptiles.
So, the correct answer is 'Mammals'.

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