You are presented with the quiz "Birds do what using the feathers that help them to fly?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says that "feathers help birds fly and provide insulation" and "to survive the chill, warm-blooded penguins rely on feathers and fat for insulation". 

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


 

   survive the chill        