Biosafety cabinets (BSC)
- BSCs have HEPA filters that can achieve 99.97% to 99.99% efficiency in filtering the most penetrating particles (0.3μm). This means that 0.3μm are the most difficult to filter.
Why is that so? Why is it easier to filter particles smaller and larger than 0.3μm?

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.

D. peatlands,grassland,swamps

Icant be totally sure but i would say with confidence that it is example #1 about cells.