Question

why does menstruation occur? ​

Answer 1

Explanation:

As a woman, your period is your body's way of releasing tissue that it no longer needs. Every month, your body prepares for pregnancy. The lining of your uterus gets thicker as preparation for nurturing a fertilized egg. An egg is released and is ready to be fertilized and settle in the lining of your uterus.

Answer 2

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menstrual cycle occus when the egg does not fertilize with the sperm.

hence, all the blood vessels that was formed for the nourishment of zygote comes out of the body in the form of blood and clot