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

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


 

  cutting down oaks       