You are presented with the question "What has a positive effect on an ecosystem?" and the following answer choices: 
- maintaining air pollution
 - removing habitats
 - stopping air pollution
 - to stay warm
 - in the frog family
 - Electric generators
 - increasing air pollution
 - genetic diversity

Now knowing that planting trees has a positive impact on an ecosystem and destruction of Trees is taking place, pollution of air is the Result of cutting trees with pace, choose the best answer.


 

   stopping air pollution      