As the train rushed down the hill, gravitational potential energy was converted into kinetic energy.
Which piece of evidence best supports the claim?
A. The speed of the train increased as the height of the
train decreased
B. The people in the train felt like they were being
pushed down at the bottom of the hill,
C. The train kept moving when it reached the flat part of
the track

Atp is is our little "pocket" of energy. of course, if you have too little, then it means you have too little energy, and you'll pass out. the way to not have enough, is to have no energy sources (glucose, fats, proteins). you can't have too many atp molecules. cycles like the krebs cycle produce it, but if you have too much of any substrate (or too little for that matter), the cycle stops and atp is no longer made (it stops until substrate levels are such that the process can go on). in any case, this is unlikely since atp is constantly hydrolyzed and remade, even while you're asleep. you won't have too much. if you have zero, you are dead or dying.