Fact 1: Mammals have a layer of fat under the skin to help insulate the body.

Fact 2: An extra layer of fat also helps protect the polar bear from the cold.

Given the two facts above, answer the question "What does a polar bear have to insulate its body?" with the following options: 
- white
 - Cold blood
 - Less fat
 - Warm blood
 - environment
 - Bodily water
 - Extra fat
 - Animal fur


 

       Extra fat  