why do fishes have two chambered heart and reptiles have three chambered heart
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The blood is pumped from a three-chambered heart with two atria and a single ventricle. (c) Reptiles also have two circulatory routes; however, blood is only oxygenated through the lungs. ... Fish have a single circuit for blood flow and a two-chambered heart that has only a single atrium and a single ventricle.
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