Question

In mammals and Birds why is it necessary to separate oxygenated and deoxygenated blood​

Answer 1

It is necessary to separate oxygenated and deoxygenated blood in mammals and birds because they need large amount of oxygen for performing cellular respiration. Also they need more energy to do work.

Answer 2

It is necessary in mammals and birds to separate oxygenated and de-oxygenated blood because

this makes their circulatory system is more efficient and

helps in maintaining constant body temperature.