Which type of mechanical weathering is most common in mountainous regions in the middle latitudes?

The most common type of mechanical weathering that occurs in mid-latitude is called frost action/frost shattering/freeze and thaw weathering. this type of weathering occurs in mountainous areas of mid-latitude regions, where the temperature fluctuates around zero degrees. When water from snowmelt or rainfall freezes in cracks in rocks it expands. The continuous expansion and contraction of rocks as water freezes and thaws will eventually cause rocks to break off into angular fragments. 

The answer is a if u read the definition it makes sense

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.