Labels:brass | scissors | vase OCR: Menstruation When girls are aged between about and 15 Years old their reproductive system undergoes sequence events which repeated every month. This IS called the menstrual cycle. . girl or woman produces one egg each month When an egg has been produced but not fertilised the lining of the womb passes out through the vagina. This called period. Blee eding stops after 5-7 days Another released into the womb aiter about 26 days and the woman can become pregnant roduc call Bleeding Anothel
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