You are presented with the question "What has a negative impact on an ecosystem?" and the following answer choices: 
- massive damage
 - Pesticides
 - good weather
 - Destroy bridges
 - planting trees
 - normal water levels
 - deforestation
 - cutting down oaks

Now knowing that cutting down trees has a negative impact on an ecosystem and oak trees are so strong, choose the best answer.


 

        cutting down oaks 