Which of the following vertebrates were the first to evolve a three chambered heart for proper distribution of oxygen in the body?

Fishes

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Reptiles

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Amphibians

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Birds

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Mammals

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Solution

The correct option is C Amphibians
A. Fishes have two-chambered heart having one auricle and one ventricle.
B. Reptiles have three-chambered heart having two auricles and one ventricle.
C. Amphibians have three-chambered heart having two auricles and one ventricle.
D. Birds have four-chambered heart having two auricles and two ventricles.
E. Mammals have four-chambered heart having two auricles and two ventricles.
Hence, the amphibians were the first to evolve a three-chambered heart for proper distribution of oxygen in the body.
So, the correct answer is 'Amphibians'.

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Amphibians are the first vertebrates to possess a three chambered heart.

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