Astone held above the ground has potential energy. when the stone is dropped, potential energy is converted to energy.
a. chemical
b. thermal
c. electrical
d. kinetic

The answer is (D) kinetic. Potential energy is the energy that is stored in an object relevant to its vertical position. When you are holding a rock up high, it has its potential energy stored within it. Kinetic energy is the energy that the object has due to its motion, or the amount of work required to get an object from a point of rest to the point of its current velocity.

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.