What į menstural cycle.
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When egg is not fertilised in female then it can destroy and come out through cervix along with mucus and blood it happens every 28 days
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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 estrogen.
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