In the life cycle of an animal with a 2n number of 80 …. meiosis occurs following fertilization to produce a multicellular organism.
meiosis will result in cells with 40 chromosomes.
fertilization will result in a zygote with 80 pairs of homologous chromosomes.
mitosis will result in cells with 40 chromosomes.
gametes will contain 40 homologous pairs of chromosomes.

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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.