GIVE REASON-
A. THE LEFT AND RIGHT SIDE OF BLOOD DOES NOT MIX IN MAMMALS AND BIRDS.
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Explanation:
The circulatory system in birds and mammals consists of oygenated and deoxydenated blood. However, they have a double circulation system where the oxygenated as well as deoxygenated blood remain separate. This is essential to maintain the body temperature efficiently over a wide range. As mammals and birds require to keep their body warm, they require a higher supply of oxygen. Thus, it is beneficial if the oxygenated blood remains separate as its mixing with deoxygenated blood can make the entire blood impure.
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