Question

why iit is necessary to separate oxygenated and deoxygenated blood in animal​

Answer 1

It is necessary in mammals and birds to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.

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Answer 2

Why is it necessary to seperate oxygenated and deoxygenated blood in mammals and birds?

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Here your answer is:

Animals like mammals and birds have to meet high energy requirements inorder to maintain constant body temperature and for locomotion.So there should be efficient supply of oxygen to meet these requirements.Therefore it is required to ensure that oxygegenated and deoxygenated blood are seperated and has to prevent its mixing.That is why mammals and aves have four chambared heart

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