Acid rain has a negative impact on water quality, and cars and trucks emit tremendous amounts of airborne pollutants, which increase acid rain. Given these facts, which of the following has the worst effect on water quality among the following options:
- bacteria
 - Pesticides
 - fossil fuels
 - deforestation
 - cars and trucks
 - humans disturb it
 - flooding
 - Destroy bridges


 

     cars and trucks    