You are presented with the quiz "What function can fur and feathers perform for some animals?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "preventing the transfer of heat from an organims 's body causes that organism to keep warm" and "fur and feathers help keep some animals warm during the harsh winter". 

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


 

      prevent bodies from transferring heat     