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In birds, the right atrium receives oxygenated blood.

In mammals, the left ventricle pumps deoxygenated blood.

In amphibians, the ventricle pumps mixed blood.

In fishes, the ventricle pumps oxygenated blood.

answer is C.

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Detailed Solution

In amphibians and reptiles, the left atrium receives oxygenated blood from the gills/lungs/skin and the right atrium gets the deoxygenated blood from other body parts. However, they get mixed up in the single ventricle which pumps out mixed blood (incomplete double circulation).

In birds and mammals, oxygenated and deoxygenated blood received by the left and right atria respectively passes on to the ventricles of the same sides. The left ventricle pumps oxygenated blood while the right ventricle pumps deoxygenated blood.

In fishes the heart pumps out deoxygenated blood which is oxygenated by the gills and supplied to the body parts from where deoxygenated blood is returned to the heart (single circulation).

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