The movement of which kind of molecules is controlled by osmosis?

The correct answer is water.  

Osmosis refers to the motion of the free water molecules through a semi-permeable membrane down a concentration gradient. The free water molecules refers to the ones, which are not associated with the solute particles, like the salt ions.  

Similar to the diffusion of the other kinds of molecules, the osmosis leads to a net difference in the concentration of water via a membrane, that is, an important activity of the biological species.  

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

b. lithosphere, asthenosphere, mesosphere   is the answer most likely