Double circulatory heart is present in

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(D) double circulatory system involves the blood passing through the heart twice for each complete circuit of the body. This is a characteristic featu

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Both $(a)$ and $(b)$

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(D) double circulatory system involves the blood passing through the heart twice for each complete circuit of the body. This is a characteristic feature of birds and mammals,where the heart is four-chambered,ensuring complete separation of oxygenated and deoxygenated blood. Therefore,both birds and mammals exhibit a double circulatory system.

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