Which of the following statements could account for the change in population seen
between years 7 and 8?
A. The birth rate of the pigeons increased.
B. The emigration rate of the pigeons
decreased.
C. The death rate of the pigeons exceeded
the birth rate,
D. The neighborhood reached its carrying
capacity for the pigeon population,

Not sure what you mean by this question

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.