In humans, what causes birth? Like one is something about estrogen and progestrone and contractions... Can someone plzz give me in exact order and detail...

Is this for homework? If so, I'd be glad to help, but first I'd like to hear what you think it is, then I can either agree with you, or help you get it right.

This, and your many of your other posts, make it sound like you are looking for homework help.

We will not do this for you. This is AMHD site policy. If you want to talk about a question, that's fine. But please stop asking for answers that seem to be tied to homework.