What effect does extreme temperature and extreme ph have on enzyme activity?

it speeds up enzyme activity.
it slows down enzyme activity.
it stops enzyme activity.
it has no effect on enzyme activity.

Well, if the temperature reading or value and the pH value are on the extreme ends, past optimal, and even past the tolerable levels for enzyme to function it would most likely stop enzymatic activity, as the enzyme would probably be denatured lose its shape due to very high conditions, thus incapable of catalyzing the said reaction.

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.