You are presented with the quiz "Arctic animals are assisted in survival by what?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "staying warm has a positive impact on an animal 's survival" and "arctic animals have layers of fat and thick coats of fur to keep warm in the frigid Arctic climate". 

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


 

        layers of fat   