You are presented with the question "What can change the color of an environment from green to brown?" and the following answer choices: 
- harmful substances
 - clouds
 - Greenhouse gasses
 - blizzards
 - deforestation
 - Greenhouse gases
 - blue skies
 - too little 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.


 

        too little rain 