Question

what is the need for menstruation in human being​

Answer 1

Answer:

Having regular menstrual cycles is a sign that important parts of your body are working normally. The menstrual cycle provides important body chemicals, called hormones, to keep you healthy. It also prepares your body for pregnancy each month.This is why menstruation is needed in humans.

Answer 2

Answer:

Hey mate, here's your answer:

Once an egg leaves the ovary, it travels through one of the fallopian tubes towards uterus. A thick lining along the uterus is formed to nourish the embryo.

If fertilisation doesn't occurs, the body doesn't need the thick lining of uterus anymore. So, finally blood, nutrients and tissues flows out of the body.

Hope it helps....❣