Question

it is not necessary to seprate oxygenated and deoxygenated bloid in birds but it is necessary for themammals​

Answer 1

Answer:

In birds and mammals have a double circulation system where both the oxygenated and deoxygenated blood maintains separate. ... It is necessary for them to separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature.

Answer 2

Answer:

Hope this helps you...