Why do girls have periods
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its is menstruation cycle in which if the egg is not fertilized then the blood , skin of uterus are expelled out of body.
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A period happens because of changes in hormones in the body. Hormones give messages to the body. These hormones cause the lining of the uterus (or womb) to build up. This gets the uterus ready for an egg (from the mom) and sperm (from the dad) to attach and grow into a baby
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