1.

Describe double circulation of blood in human beings. Why is it necessary?​

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Answer: down below mark me as brainliest

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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