Question

why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds??​

Answer 1

Answer:

all energy would be used in separating oxygenated and deoxygenated blood and we might get lethargic as we also have to maintain our body temperature since we are warm blooded

Answer 2

Answer:

To Carry out the process of respiration

Explanation:

If deoxygenated and oxygenated blood won't be separated it might lead to anaerobic respiration which is not good for health.