Question:

What happens when:
The ovum is fertilized?
The ovum is not fertilized?

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Fertilization leads to embryo formation, while failure of fertilization causes menstruation.
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Solution and Explanation

(1) When fertilization occurs:
The fertilized egg (zygote) undergoes cell division and forms an embryo.
The embryo implants into the uterine wall and develops into a fetus.
(2) When fertilization does not occur:
The uterine lining sheds through the vagina in a process called menstruation.
This happens approximately every 28 days.
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