Question

Mamalas and birds have 4 chambered heart why?
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Answer 1

for the transportation of blood

Answer 2

In mammals and birds, the heart is also divided into four chambers: two atria and two ventricles (figure d). The oxygenated blood is separated from the deoxygenated blood, which improves the efficiency of double circulation and is probably required for the warm-blooded lifestyle of mammals and birds.