what is meant by periods? How do they form
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Explanation:
Menstruation or periods are a part of female reproductive cycle.
They occur when ova/egg form in the ovary and move to the uterus. Here it stays for some time to get fertilized after copulation. If not so, it along with some blood vessels and uteral lining disintegrate and flow out of the vagina in the form of blood. This is known a periods.
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