Heart is two chambered in:

Fishes

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Amphibians

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Reptiles

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Birds

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Mammals

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Solution

The correct option is A Fishes
A. Fishes have a two-chambered heart (one auricle and one ventricle).
B. Amphibians have a three-chambered heart (two auricles and one ventricle).
C. Reptiles have incompletely four-chambered heart (two auricles and partly divided ventricles).
D. Birds have a four-chambered heart (two auricles and two ventricles).
E. Mammals have a four-chambered heart (two auricles and two ventricles).
So, the correct answer is option A-'Fishes'.

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