I think the answer is D but it's been a while since I've done this.
Answer:
via "active transport"
Explanation:
Active transport refers to the natural movement of molecules across a cell membrane from lower concentrations to higher concentrations. This cellular mechanism has the role to reduce the differences in the concentrations of these molecules
Plants absorb me from the soil through assimilation, I am eaten by animals the animals and plants die and decompose where I am released back into the soil, weathering and erosion cause me to release out of rocks, I then find my way into the ocean being carried by water, I then return to the soil through the water.