Fact 1: Cutting down trees has a negative impact on an ecosystem.

Fact 2: Trees are cut down in the forest and are then sent to a paper mill.

Given the two facts above, answer the question "a what can have a negative impact on ecosystem" with the following options: 
- paper mill
 - A virus
 - deforestation
 - storm
 - disease
 - rainfall
 - tree
 - Pollution


 

 paper mill        