On a timed exam
chris drew a diagram to compare the ways in which different organisms obtain nitrogen.

venn diagram with two intersecting circles. one circle is labeled consumers and has the label x within it. the other circle is labeled producers.
which label belongs in the area marked x?

breathe in from atmosphere
produce themselves
eat other organisms
absorb from soil

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.