Hair helps to insulate and protect the body, and hair is built by the hair follicle from dead proteins produced by skin cells called keratin. Given these facts, what from dead proteins help to insulate and protect the body among the following options:
- follicles
 - bioaerosols
 - Energy
 - sweating
 - fossil fuels
 - layers of fat
 - fur and fat
 - fungi


 

 follicles        