Hair helps to insulate and protect the body, and hair grows from hair follicles within the skin. Given these facts, what helps insulate and protect the body among the following options:
- layers of fat
 - follicles within the skin
 - with their fur
 - the sun
 - it has a positive impact on it
 - electrons
 - sound waves
 - that material's properties


 

  follicles within the skin       