Fact 1: Erosion of soil has a negative impact on the environment.

Fact 2: Forest environments collapse.

Given the two facts above, answer the question "What has a negative impact on forests?" with the following options: 
- local fauna
 - local flora
 - humans disturb it
 - deforestation
 - erosion of soil
 - smallpox
 - local wildlife
 - vehicles


 

     erosion of soil    