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11. What happens during menstruation phase? A. The ovary releases an egg. B. The egg cell and sperm cell unite. C. The uterine lining begins to break down and bleeding results. D. The endometrium becomes thicker in preparation for egg implantation​

Sagot :

Answer:

C.

Step-by-step explanation:

In the part of cervix inside the vagina, the endometrium or the uterine linings break down so the blood in girls menstruation is the endometrium that currently breakdowns. It breaks down because it's kinda a preparation for the upcoming ovulation period for the girls.

I'm not a girl but I hope it helps ...