Why is it necessary to saparate oxygenated and deoxygenated blood in mammals and birds???
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It is necessary to separate oxygenated and deoxygenated blood in mammals and birds or any human because if they mix with each other they make the whole blood deoxygenated and infertile so after this some parts of the body may not work properly...........
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because they want high energy for there all metabolic activities
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