Question

in mammals and birds oxygen oxygenated blood and deoxygenated blood separated why

Answer 1

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Because of 4 chambered heart the blood is separated and transported separately.

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Answer 2

Mammals and birds are warm blooded animals . So separation of oxygenated and deoxygenated blood is important to meet the their energy requirements.

In other organisms mixing of blood is tolerated like in fishes as they do not have great energy needs