When protons move down their electrochemical gradient into the mitochondrial matrix, what do they do

What are some things that limit population growth?

Name the organs of humanelemintary canal.

Johnny rode his bike 4 blicks down the street to his friend's house once he got to his friend house and realized he could not cone out to play he turned aroubd and went back home.what is displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point