why human have double circulation and how is it useful
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Humans have double circulation because they have four chambered heart and human needs oxygenated blood that is pure blood so the four chambered heart is helped in all these things
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During a single cycle blood goes twice in the heart which is known as double circulation. It is necessary in human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system is more efficient and helps in maintaining constant body temperature.
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