You are presented with the question "what can be used to make clothing for keeping warm?" and the following answer choices: 
- cellulose
 - bamboo
 - heat
 - fibrous
 - otters
 - energy
 - chemicals
 - Loose

Now knowing that thick fur can be used for keeping warm and otters fur is the thickest fur of any animal, choose the best answer.


 

     otters    