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______is when the uterus lining breaks down and blood comes out from the vagina.This is called the menstrual flow​

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Answer:

A woman's period, or menstruation, is when the lining of the womb sheds, along with blood, exiting through the vagina. When these periods occur regularly, this is referred to as the menstrual cycle. A period happens if egg fertilization does not occur. This menstruation usually lasts 3-5 days.

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