Double circulation is found in the heart of

Birds and amphibians

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Birds and mammals

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Fishes and amphibians

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Amphibians and reptiles.

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Solution

The correct option is B Birds and mammals
In double circulation, blood flows twice through the heart, during each cycle of passage through the body. It has two separate circuits - the pulmonary circuit and syatemic circuit. Mammals as well as birds have a complete double circulatory system that allows oxygenated and deoxygenated blood to flow separately from each other within the heart.
So the correct answer will be option B.

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Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.

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