You are presented with the question "What is used to protect plants from contracting molecules?" and the following answer choices: 
- greenhouses
 - staying warm
 - Enzymes
 - earmuffs
 - electricity
 - jackets
 - sweaters
 - exoskeleton

Now knowing that agreenhouse is used to protect plants from the cold and molecules expand with heat and contract with cold, choose the best answer.


 

 greenhouses        