Answer:
First stage: This starts with contractions and your cervix dilating and ends when your cervix is fully open. ...
Second stage: This is when you push your baby through the birth canal.
Third stage: This ends with the delivery of the placenta, also called afterbirth.
Explanation:
Well you haven't provided any answer options so answer options include things like mountain climbing. Mountain climbing involves multiple systems and functions over a long period, with moderate being something like hiking the same mountain.
