Answer:
I think it is the first one
There is more solute in the roots
Organisms who happen to be best suited to an environment and reproduce most successfully will be consider successful in terms of natural selection.
Because it causes them to move, and so they weather that way. Buut the acid rain can leak into the rock and slowly break down the atoms, causing it to chemically weather faster. Also, just regular water/rain can wash away some covering sediment.
