define mensuration cycle answer fast because I have to do in biology ......fast plzzz
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This cycle of events takes place every month periodically and is called menstruation . The span of menstrual cycles is about 28 days. When do the menstruation begins in girls. A girl can start her period anytime between the ages of 8 and 15.
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The menstrual cycle is the regular natural change that occurs in the female reproductive system that makes pregnancy possible. The cycle is required for the production of oocytes, and for the preparation of the uterus for pregnancy. The menstrual cycle occurs due to the rise and fall of estrogen.
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