Question

What is menstruation

Answer 1

Menstruation, also known as a period or monthly, is the regular discharge of blood and mucosal tissue from the inner lining of the uterus through the vagina. 
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Answer 2

Mensuration is a monthly process occur in a girl or women . In this inner soft lining of uterus made up of muscle breaks down and flow our in the form of vaginal bleeding

Mensuration doesn't occur in the pregnant women