Question

what happen when the egg is not fertilised

Answer 1

Every 28 days or so, one mature egg is released from the ovary. This is called ovulation. After the egg is released, it moves into the fallopian tube where it stays for about 24 hours. If the egg is not fertilized during that time, the eggdisintegrates (breaks down) and menstruation (your period) begins 2 weeks later.
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Answer 2

Answer:

If zygote is not formed, the inner wall of uterus breaks which causes bleeding through vagina. This process is called MENSTRUATION. It occurs at a regular interval of 28 days.

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