You are presented with the question "insulated material can be used to prevent wasting a lot of what?" and the following answer choices: 
- sunny days
 - body heat
 - body water
 - heat energy
 - contained areas
 - electricity
 - fever sweats
 - power

Now knowing that insulated material can be used for keeping warm and birds waste a lot of body heat trying to keep warm in exposed areas, choose the best answer.


 

  body heat       