You are presented with the quiz "What serves as insulation to keep the body warm?" 

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 "first, a hat serves as insulation against convective heat transfer". 

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


 

  wearing hats         