Why menstruation occurs explain?

1.	Why menstruation occurs explain?
Answer» In females, one egg is released from one ovary every month. Every month, the uterus prepares itself to receive the embryo in case fertilization occurs. But if fertilization does not occur, the uterine wall is shaded off in order to prepare itself for the ovary which will be released in the coming month. Hence, to discard the unwanted uterine endometrial lining and the ovary which is not fertilized the menstruation occurs in human females. Due to puberty

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