You are presented with the question "What do humans use when living in a cold climate?" and the following answer choices: 
- energy
 - spaceships
 - hair
 - freezers
 - weapons
 - fur
 - Blankets
 - chemicals

Now knowing that energy is used for heating a building by a heating system and sometimes, in a cold climate it is necessary to use heat, but use only slow heat, choose the best answer.


 

 energy        