You are presented with the question "Which of the following can release harmful substances into the environment?" and the following answer choices: 
- vehicles
 - cigarettes
 - fossil fuels
 - Thunderstorms
 - Photosynthesis
 - Pesicides
 - Tree sap
 - mines

Now knowing that pesticides can cause pollution and pollution is the release of harmful substances into the environment, choose the best answer.


 

      Pesicides   