None of the bove. Soil erosion occurs due to deforestation, water, wind and tillage of the land farms. It is the removal of the top layer of the soil, and leads to poorer quality of soil, called a soil disruption. This can be avoided by using proper farming techniques and afforestation.
If decomposers were here then their would be a ton of waste and the dead and bacteria will pile up
C) To gather info about the natural world, to explain natural phenomena, and allow reasonable predictions of future events
