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Why the complete double circulation is m...

Why the complete double circulation is more prominent in mammals?

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Mammals have twoauriclesoratrialchambers and two ventricles, the auricles and ventricles are separated by inter auricular septum and inter ventricular septum. Hence there is complete separation of origenaled blood from the deoxygenated blood. Pulmonary and systemic circuits are evideni. So this ype of circulation is more prominent in mammals
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