Normal heart sounds are caused by which events?

S1 and S2 which is caused by opening the Tube

Explanation:

yes, it is pretty much the same thing, which is cool. : )

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.