I believe rottening would be the answer. Rotting, dead plants and animal feaces make great fertilizers.
Active transport is the homeostatic process that moves particles against a concentration gradient.
The region that would be eroded the most would be those at the slopes of the mountain. When heavy rainfall comes, the soil in these regions gets soften thus being forced down forming a run-off due to the force of gravity. These eroded soil would eventually continue to the valleys thus causing landslides.
the answer is algae because algae is an aquatic plant
