Question

Why do birds and mammals have completely partitioned heart

Answer 1

Answer:

Birds have four chambered heart because during flight they need more energy. So, that they can fly easily without any difficulty. Mammals have four chambered heart because heart helps to supply oxygenated blood to all parts of the body, which is important for us.

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Answer 2

To no to mix the oxygenated blood from lungs and deoxygenated blood from other body tissues