You are presented with the question "a part of birds where what is dominant to curly helps them fly and provides insulation?" and the following answer choices: 
- Animal fur
 - bioaerosols
 - fur and fat
 - Vanes
 - Epidermis
 - sweating
 - staying warm
 - straight

Now knowing that feathers help birds fly and provide insulation and straight feathers are dominant to curly feathers , choose the best answer.


 

        straight 