Birds and mammals have

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(B) Birds (Class $Aves$) and mammals (Class $Mammalia$) are endothermic animals that maintain a constant body temperature.To support their high metabo

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Four chambered heart

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(B) Birds (Class $Aves$) and mammals (Class $Mammalia$) are endothermic animals that maintain a constant body temperature.To support their high metabolic rate and efficient oxygen delivery,they possess a four-chambered heart.This structure ensures complete separation of oxygenated and deoxygenated blood,which is an evolutionary adaptation for high energy requirements.

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