Chimpanzees have been trained to communicate with humans through:

Chimpanzees have been trained to communicate with humans through sign language. Chimpanzees have relatively large brains and as such have complex social relationships and use simple tools. They can be taught to use sign language and some researchers suggest that they can communicate via this medium at the level of a 4 to 5 year old human. 

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.