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

Question

Quinn · Answer

Answer:   In birds and mammals have a double circulation system where both the oxygenated and deoxygenated blood maintains separate. ... They must separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature.     Explanation:   please mark me as brainliest

Lyla

13. The smallest 4-digit number having
three different digits is
a)1102
b)1012
c)1020
d)1002

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