You are presented with the question "Too little of what can change the color of an environment from green to brown?" and the following answer choices: 
- pool water
 - energy
 - bath water
 - Acids
 - algae
 - heat
 - water hose
 - rain

Now knowing that adrought can change the color of an environment from green to brown and too little rain causes a drought, choose the best answer.


 

        rain 