Question

why is double circulation necessary for humans???? ​

Answer 1

Answer:

yes it is necessary in humans

Explanation:

Because oxygenated blood don't mix with deoxygenated blood in this type of circulation

Answer 2

Answer:

Blood flow twice through the heart in one cycle, because the two different formes of blood oxygenated and deoxygenated blood and the separation of oxygenated and deoxygenated blood