happen when the ovum is note fertilized
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Explanation:
If the ovum gets fertilized, the zygote gets implanted. However, if fertilization does not occur, the egg withers away and the thick cell lining of the uterus gets removed and discharges the contents through the birth canal. This process is referred to as menstruation.
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When the ovum is not fertilized the lining of the uterus is sheded in the form of blood.
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