I think life is like that, you are not born being perfect knowing everything, so I think you should try till you get good at it. I will put an example: babies when they first start to walk they fell but do you see a baby not getting up? or it just stay's there in the ground NO that baby gets up and keeps trying till he learns how to walk. that's the way our daily life should be. hope this has helped you.
Peristalsis is the rhythmic contaction and expansion used for moving food through the body. Emesis is the action of vomiting and stoma is an opening like stomata so peristalsis is the correct option