If carbon dioxide is needed photosynthesis and water is plentiful, which of the following is likely to occur? a. additional water will be gained and the plant cells will become rigid. b. the stomata will open until too much water is lost. c. water pressure is going to decease in the guard cells. d. the stomata will close until enough water is lost.

D. The stomata will close until enough water is lost.
Hope this helps

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.