Mutagen is an environmental agent that changes the DNA.
The answer is the Somatic Nervous System and the Autonomic Nervous System.
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.
