You are presented with the quiz "How do sea lions keep warm?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "mammals have a layer of fat under the skin to help insulate the body" and "harbor seals, like sea lions, have evolved to utilize a layer of fat called blubber". 

So, what's the best answer to the question?


 

      Blubber     