Question

Give reason:
3. Double circulation is an efficient way of blood circulation in humans. ​

Answer 1

Answer:

1 it doesn't allow oxygenated blood to mix with de oxygenated

2allows body organs to work efficiently with oxygenated blood.

Answer 2

hope this helps u

Double circulation is an efficient way of blood circulation in humans  because in some mammals , and animals cannot tolerate    mixing the oxygen and  co2  so only we have double circulation in humans