Answer:
The structure of heart
of fishes, reptiles, birds and mammals show many structures of evolutionary
significance. Thicker walls of ventricles is one of them.
Ventricles have
thick walls because these are mainly involved in pumping the blood to the body
parts with certain pressure.
The walls of
the left ventricle is about 3 times thicker from the right ventricle, while the
atria acts as a collecting chambers for the blood which is starting to the
heart thus have thin walled. Also they have to force the blood into the
ventricles that lies just below there thus atria have thin walls.
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