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when it breaks down, menstruation occurs

Sagot :

Answer:

The 1st day of your menstrual cycle starts on the 1st day of your period (AKA menstruation). During your period, blood and tissue from the lining of your uterus flows out of your vagina. If you get your period, it means you didn't get pregnant during your last cycle.

Answer:

the lining of the uterus

Explanation:

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