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

Fact 2: Harbor seals, like sea lions, have evolved to utilize a layer of fat called blubber.

Given the two facts above, answer the question "How do sea lions keep warm?" with the following options: 
- protected
 - warm
 - Swimming fast
 - Sleeping
 - hydration
 - Blubber
 - four limbs
 - Eating a lot of fish


 

      Blubber   