The greenhouse effect is

a) human activity has no effect on elements, chemical compounds, and other forms of matter.

b) living organisms are not limited by any one nutrient.

c) nutrients are circulated throughout the biosphere.

d) many nutrients do not reach toxic concentrations in the biosphere.

Ithink that b is correct but just in case wait to see if someone else answers

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.