How is an open system different from a closed system? A. An open system does not follow the law of conservation of mass while a closed system does.

B. An open system is not balanced.

C. An open system allows matter to enter and leave during a chemical reaction, while a closed system does not.

D. Open systems will be scals prior to initiating the reaction.

The answer is C because what it says is true

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.

Atissue is a group of connected cells that have a similar function within an organism.