birds and mammals have four chambered heart .why?
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Mammals and birds have four chambered heart as they have high energy needs in order to maintain their body temperature. Seperation of the chambers prevents the mixing of the oxygenated and deoxygenated blood which allows a high efficient supply of oxygen to the body.
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Birds and mammals are warm-blooded animals and maintain a constant body temperature by cooling themselves when they are in a hotter environment and vice versa. So, for respiration to carry out, more eoxygen is required.
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