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Why does menstruation happen?

User Eselskas
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During that, menstruation stops because the blood came from the uterus protect it and give nourish to the fertilized egg. It usually happen because a sperm cell meet it. When menstruation happens, it develop an egg cell and carried out with the lining of the uterus called the endumetrium because it dies.

User Iwat
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The menstrual cycle occurs due to the rise and fall of hormones
User Defines
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