- Cephalopods show a much higher degree of structural and behavioral complexity than other groups of molluscs
What factors triggered the evolution of these changes? A rich fossil record shows that once they were very common
and even dominant in some environments. Now there are only about 650 living species of cephalopods, far fewer
than gastropods Were cephalopods successful? What do you think happened along the way?

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.