Question

what changes are observed in the uterus if fertilisation does not occur​

Answer 1

Answer:

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Explanation:

Since, the ovary releases one egg every month, the . If the egg is not fertilised, it lives for about one uterus also prepares itself every month to receive fertilised egg . Its lining becomes thick and spongy

This would be required for nourishing the embryo if fertilisation had taken place. However, in the absence of fertilisation, the lining slowly breaks and comes out through the vagina as blood and mucus. This cycle takes place roughly every month and is known as menstruation. It usually lasts for about 2-8 days.

Answer 2

Answer:

Every month, the uterus prepares itself to receive a fertilized egg. Therefore, the inner lining of the uterus becomes thick and is supplied with blood to nourish the embryo. If the egg is not fertilized, then the lining of the uterus breaks down and gets released in the form of blood through the vagina. This lasts for about two to eight days. This cycle occurs every month and is known as the menstrual cycle.  

Explanation: