You are presented with the question "a what can have a negative impact on ecosystem" and the following answer choices: 
- paper mill
 - A virus
 - deforestation
 - storm
 - disease
 - rainfall
 - tree
 - Pollution

Now knowing that cutting down trees has a negative impact on an ecosystem and trees are cut down in the forest and are then sent to a paper mill, choose the best answer.


 

 paper mill        