How does fertilization occur?

when two cells, egg and sperm, join together and the resulting cell has a complete set of chromosomes

happens between to organisms in which one harms the other

the joining of egg and sperm together

when a cell multiplies in the body to create another

when plants and animals become part of the food chain

A when two cells , egg , and sperm , join together and the resulting cell has a complete set of chromosomes

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.