Why manshuration occur

1.	Why manshuration occur
Answer» If egg is not fertilised, it lives for about one day.since the ovary releases one egg every month,the uterus also prepares itself every month to receive fertilised egg .This cycle takes place roughly every month and known as mensuration When the egg is not fertilized it forms the lining on uterus and then this line breaks down known as menstruation or periods When egg is not fertilized

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