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Name an animal having two-chambered heart.

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Fishes have two chambered heart. The heart includes one auricle and one ventricle. But two chambereed heart is less efficient because in two chambered heart mixing of oxygenated and deoxygenated blood occurs. That is why two chambered & three chambered heart evolved into four chambered heart in humans as it prevents mixing of oxygenated and deoxygenated blood.

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