Why girls have their periods?
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it's a menstrual cycle in which the wall breaks down once in a month if the egg is not ovuled
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A period happens because of changes in hormones in the body. Hormones are chemical messengers. The ovaries release the female hormones estrogen and progesterone . These hormones cause the lining of the uterus (or womb) to build up. The built-up lining is ready for a fertilized egg to attach to and start developing.
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