Fact 1: Head hair is especially important in preventing heat loss from the body.

Fact 2: Hair is actually composed of a protein called keratin.

Given the two facts above, answer the question "What is important in preventing heat loss from the body?" with the following options: 
- hydration
 - a cuticle
 - stay warm
 - sweating
 - warmth
 - skin
 - keratin
 - Animal fur


 

       keratin  