Mammals have a layer of fat under the skin to help insulate the body, and an extra layer of fat also helps protect the polar bear from the cold. Given these facts, what does a polar bear have to insulate its body among the following options:
- white
 - Cold blood
 - Less fat
 - Warm blood
 - environment
 - Bodily water
 - Extra fat
 - Animal fur


 

       Extra fat  