Question

menstruation is caused by​

Answer 1

Menstruation often commonly known as periods is caused when the ovary prepares eggs for fusion with sperms but they end up unfertilised, it happens because after a fixed period of fixed days the uterus prepares itself for the fertilisation of egg but when it is left unfertilised the the inner linings consisting of rich amount of blood capillaries breaks and comes out with further blood and cause sudden pain sometimes.
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Answer 2

Answer:

Explanation:

Every month or so, the uterus lining gets thicker to prepare for a fertilised egg if the woman becomes pregnant. If the egg doesn't get fertilised, that lining is released from the body as blood through the vagina. This monthly process is called menstruation or a period.