Give reason oxygenated and deoxygenated blood are separated
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Main reason behind the separation is that we are warm-blooded animals
if they are not separated then temperature of our body will not be maintained properly and we would have become cold blooded animals like fishes and amphibians. Our body structure are so complex, and our body temperature should be continuosly maintained to do various metabolic activities; That's one of the reason why our heart also acts as a thermoregulatory organ.
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