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What will happen if the ovum is not fertilised?

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In a female human, ovulation occurs once in a month. The uterus is starting to prepare itself to receive the fertilized egg. It grows thick, muscular and rich in blood and tissues.

When the egg is not fertilized, the thick uterus lining breaks down. The blood, tissues and the non-fertilized egg come out of the vagina as menstruation.

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