You are presented with the question "What can planting trees reduce?" and the following answer choices: 
- Pollutants
 - energy barrier
 - competition
 - temperature
 - Fire danger
 - Shade
 - Trees
 - disease

Now knowing that planting trees has a positive impact on an ecosystem and forest ecosystems, from trees to microbes, remove pollutants in a number of ways, choose the best answer.


 

 Pollutants        