For which activities is the parasympathetic nervous system generally responsible?

Called also “rest and digest” so for digestion it stimulates gastric secretion intestinal peristaltism
vasodilatation on the vascular system of the intestinal tract so it increases there blood flow for absorption. stimulates lacrimary glands . Micturition it stimulates the detrusor vezical muscle .

I’d go with d hope it

It might. it might because if you think about if they discovered if we came from (lets say something funny like aliens) and thy found cells that matched and they would have t do more research about it but would most probably change their theory.