Question

why mamals and birds have four chambered heqrt​

Answer 1

The four-chambered heart has a distinct advantage over simpler structures: It allows us to send our "dirty" blood to the cleaners-the lungs-and our "clean" blood to the rest of the body without having to mix the two. That system is very efficient. The blood coming from the left side of the heart is pure, fully oxygenated, and ready to fuel the muscles. A fish heart, on the other hand, has to pump blood, which is only half as pure, to the body because it doesn't have separate chambers that enable it to clean the blood in one cycle and distribute it in the next.

Answer 2

Answer:

I don't know

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