You are presented with the question "Birds do what using the feathers that help them to fly?" and the following answer choices: 
- to move people
 - running and lifting
 - survive the chill
 - during the day
 - Move to another area
 - Earth orbiting the Sun
 - to stay warm
 - supersonic

Now knowing that feathers help birds fly and provide insulation and to survive the chill, warm-blooded penguins rely on feathers and fat for insulation, choose the best answer.


 

   survive the chill      