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Why does a female have menstrual flow?

Sagot :

because these is process in a woman of discharging blood and other materials from the lining of the uterus and intervals of about one lunar month from puberty until menopause, except During pregnancy. and for women to lose the dirt on his body.

>Hope it helps
don't copy my answer,it is based on my mind !!
From: TaengPark