why changes are observed in the uterus if fertilization does not take place
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When an egg is released by ovary the walls of uterus thickens so as to give the fertilised egg a smooth covering but as fertilisation doesnt occur the walls come back to their original postion by breaking down and thus the blood in it starts flowing out through urethra..
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Explanation:
when a egg is released by ovary the wall of uterus thickness so as to give the fertilised egg a smooth covering but as a fertilisation does not occur the wall come back to their original position by breaking down and thus the blood in it starts the flowing out through urethra.
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