In mammals and birds why is it necessary to separate oxygenated and de-oxygenated blood -Biology

In mammals and birds why is it necessary to separate oxygenated and de-oxygenated blood -Biology
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Mammals and birds are warm blooded animals. This means they can control their body temperature and do not have to depend on environment for their body temperature regulation. Because of this birds and mammals require optimum oxidization of glucose which would be possible with good supply of oxygen. So it is required to have separate oxygenated and de-oxygenated blood to supply the required amount of oxygen.
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