You are presented with the question "What is used to protect producers and keep them warm?" and the following answer choices: 
- an electric stove
 - sweaters
 - green houses
 - dirt
 - animal fur
 - In the winter
 - evaporation
 - plant fans

Now knowing that agreenhouse is used to protect plants by keeping them warm and plants are Earth's producers, choose the best answer.


 

   green houses      