Scientists believe that the appendix used to serve a digestive function when humans were forced to eat things that they no longer need to, like tough fibrous plant material or raw meat full of bacteria and parasites. However, the appendix no longer has a specific function and can be removed without consequences for overall digestive functionality. This means that the appendix is what type of structure?

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.