Hair is a fiber that is found only in mammals, and sebaceous glands associated with hair follicles protect the skin of mammals. Given these facts, what protects a mammal's skin among the following options:
- Fiber follicles
 - Exfoliation
 - resistance
 - layers of fat
 - evaporation
 - a cuticle
 - sensory neurons
 - fur and fat


 

 Fiber follicles        