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Menstruation occurs at the end of a woman's menstrual cycle. The lining of the uterus is shed and expelled from the body. Menstruation occurs in humans and more developed apes, including [[gorillas]] and [[orangutans]] [http://www.4woman.gov/faq/menstru.htm#4].
Menstruation occurs at the end of a woman's menstrual cycle. The lining of the uterus is shed and expelled from the body to prepare the uterus for a fertilized ovum. Menstruation occurs in humans and more developed apes, including [[gorillas]] and [[orangutans]] [http://www.4woman.gov/faq/menstru.htm#4] from puberty to menopause.
[[Category:Biology]]
[[Category:Biology]]