You are presented with the question "What helps to insulate and protect the body?" and the following answer choices: 
- tail fins
 - Animal fur
 - fur seals
 - keratin
 - nitrogen
 - snow
 - Epidermis
 - poultry

Now knowing that hair helps to insulate and protect the body and hair is composed of the protein keratin, choose the best answer.


 

    keratin     