Question

Describe double circulation in human beings. Why is it necessary​

Answer 1

Answer:

So, it is called Double Circulation of blood. ... It is necessary in human being 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

Answer:

Double circulation of blood in human beings is necessary because to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.