Fact 1: Hair helps to insulate and protect the body.

Fact 2: Hair is composed of the protein keratin.

Given the two facts above, answer the question "What helps to insulate and protect the body?" with the following options: 
- tail fins
 - Animal fur
 - fur seals
 - keratin
 - nitrogen
 - snow
 - Epidermis
 - poultry


 

    keratin     