Question

why it is necessary to kept separated oxigenated or de oxy genated bood in mammanls and birds

Answer 1

organisms need higher energy to maintain their body temperature
if it would not be done, then deoxygenated and oxygenated blood mixes with each other which will lead to decrease in oxygen level in blood

Answer 2

Answer:

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

Explanation:

hope it helps!