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

Fact 2: Oak trees are so strong.

Given the two facts above, answer the question "What has a negative impact on an ecosystem?" with the following options: 
- massive damage
 - Pesticides
 - good weather
 - Destroy bridges
 - planting trees
 - normal water levels
 - deforestation
 - cutting down oaks


 

        cutting down oaks 