Question

why periods come in a month not in year or after 6 month

Answer 1

Because its a monthly cycle and either of the ovaries release an egg, naturally occurring in a time period of 28 days.


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Answer 2

periods came each and every month of a female after puberty due to hormonal secretion in body of a female .These hormons will be of limited period and acts in body
.. therefore each hormone is responsible for its activity and will certainly work .. hence the period came every month