You are presented with the question "What is important in preventing heat loss from the body?" and the following answer choices: 
- hydration
 - a cuticle
 - stay warm
 - sweating
 - warmth
 - skin
 - keratin
 - Animal fur

Now knowing that head hair is especially important in preventing heat loss from the body and hair is actually composed of a protein called keratin, choose the best answer.


 

       keratin  