what is the need of four-chamber heart in mammals while fishes have two-chamberd heart?
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fishes have venous blood means mixed blood and hence less oxygen content while 4 chambered heart in human makes sure that there won't be any mixing of oxygenated and deoxygenated blood and hence ensures more oxygen level in human blood.
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Mammals need four chambered hearts to avoid the mixing of oxygenated and deoxygenated blood because oxygenated blood travels in left auritum and then goes to left ventricle before being pumped into the body whereas deoxygenated blood travels in right auritum and then goes to the right ventricle before being pumped into the lungs for oxygenation. Fishes have two chambered hearts because they can tolerate some mixing of oxygenated and deoxygenated blood as their energy needs are not as high as humans
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