You are presented with the question "What helps maintain body temperature?" and the following answer choices: 
- hats
 - Lift
 - the inside of a refrigerator
 - fur
 - skin
 - arctic winds
 - freezing water
 - hair

Now knowing that an animal usually requires a warm body temperature for survival and mammals are also warm-blooded and are covered with hair or fur, choose the best answer.


 

    fur     