Question

what is menstruation ? how many days it occur?
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Answer 1

Answer:

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Explanation:

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Answer 2

Explanation:

Testosterone is the male hormone and estrogen the female hormone. The uterine wall breaks down in females to prepare itself to receive the developing fertilised egg. In case there is no fertilisation ,the thickened lining of uterine wall breaks down and goes out of the body along with blood. This is called as menstruation. It occurs about 4-6 days

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