Which of the following statements is true regarding both theories and laws?
change over time
cannot be proven
require consensus
supported by observations

Theories may change over time. Unversal laws are supposed to not change.

Most theories and laws cannot not be definetly proved and they are constantly tested.

Consensus is not necessary. Many theories were discarded by the majority of scientific community before been accepted.  

Both theories and laws must be based on scientific method and observations are a key part of it. Then, in my opinion, the true statement is that both are supported by observartios.  

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.