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

Fact 2: Hair is built by the hair follicle from dead proteins produced by skin cells called keratin.

Given the two facts above, answer the question "What from dead proteins help to insulate and protect the body?" with the following options: 
- follicles
 - bioaerosols
 - Energy
 - sweating
 - fossil fuels
 - layers of fat
 - fur and fat
 - fungi


 

 follicles        