In an Antarctic ecosystem, phytoplankton are the main producers. A
species of zooplankton, called krill, are the primary consumers. To some
extent, fish, penguins, seals, whales, and other animals of the ecosystem
depend on krill to survive. Which of these is a biotic factor in this
ecosystem?
A. the amount of ice at any given time
B. che amount of salt in the ocean water
C. the temperature of the air and water
D. the size of the krill population

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.