You are presented with the question "What is used to protect plants by keeping their temperature?" and the following answer choices: 
- a white house
 - energy
 - an electric stove
 - a microwave
 - electricity
 - a thermometer
 - exoskeleton
 - a greenhouse

Now knowing that agreenhouse is used to protect plants by keeping them warm and temperatures go from warm to hot, choose the best answer.


 

        a greenhouse 