define the double circulation of blood. why it is necessary?
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Answer:mark me brainliest if it helps
Explanation: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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Answer double circulation is necessary
irrxplanation:
Because as we are having two blood namely deoxygenated oxygenated blood . it should mix .so, double circulation is nessary
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