What is present in birds and mammals?

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(C) Birds and mammals exhibit a $4$-chambered heart ($2$ atria and $2$ ventricles).This structure prevents the mixing of oxygenated and deoxygenated b

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Double and closed circulatory system

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(C) Birds and mammals exhibit a $4$-chambered heart ($2$ atria and $2$ ventricles).This structure prevents the mixing of oxygenated and deoxygenated blood,which is a characteristic of a double circulatory system.Furthermore,the blood flows through a series of vessels (arteries,veins,and capillaries),which defines a closed circulatory system.Therefore,birds and mammals possess a double and closed circulatory system.

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