You are presented with the question "Feathers help birds fly and what?" and the following answer choices: 
- staying warm
 - keep warm
 - Absorb light
 - allow growth
 - keep birds
 - protect them
 - keep cool
 - keep grounded

Now knowing that feathers help birds fly and provide insulation and penguins keep warm with layers of insulation, choose the best answer.


 

  keep warm       