Question

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

Answer 1

It is necessary in mammals and birds to separate oxygenated and de-oxygenated blood because this makes their circulatory system more efficient and helps in maintaining constant body temperature.

Answer 2

$\large\color{red}\mathcal{Hello\:Friend}$

It is necessary to seperate oxygenated and deoxygenated blood in the mammls and birds because their body is more complexly designed and can't tolerate certain amount of mixing of blood.

And also it is helpful in maintaining their body's Temperature.