Question

What is menstruation?
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Answer 1

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The menstrual cycle is the regular natural change that occurs in the female reproductive system that makes pregnancy possible. The cycle is required for the production of oocytes, and for the preparation of the uterus for pregnancy. The menstrual cycle occurs due to the rise and fall of hormones...

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Answer 2

$\huge \bf{Menstruation.}$

If fertilisation does not take place then breakdown and removal of the thick, spongy lining of the uterus in the form of vaginal bleeding.