Why does menstruation occur?

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(B) Menstruation is a process in which blood and mucous flow out every month through the vagina.This process occurs because one egg is released from t

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Because the egg is not fertilized and the uterine lining is shed.

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(B) Menstruation is a process in which blood and mucous flow out every month through the vagina.This process occurs because one egg is released from the ovary every month,and simultaneously,the uterus (womb) prepares itself to receive a fertilized egg.The inner lining of the uterus becomes thick and is supplied with blood to nourish the potential embryo.If the egg is not fertilized,the thickened lining of the uterus is no longer needed,so it breaks down and is released in the form of blood and mucous through the vagina.

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