what happens when egg is not fertilised?
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1. the uterus prepare itself every month to receive fertilized egg.
2. the linning of the uterus becomes thick and spongy ,required to support the embro.
3. when fertilization had not taken place ,this linning ins not needed any longer.
4.this lining breaks and comes out through vagina as blood and mucus .This cycle takes around 28 days every month and called menstruation.
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