why it is necceasary to sperate oxydated and de oxydated blood in mammels
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They must separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature. It is also better if the oxygenated blood stays separate, as its combination with deoxygenated blood will impure the entire blood.
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The circulatory system of mammels and birds is more effiicient and can maintain their constant body temperature.
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