Mammals conserve body heat with their hair or fur, and hair follicles are capable of producing hair of various thickness and colors. Given these facts, mammals conserve body heat with what that produce thickness and colors among the following options:
- sweating
 - Exfoliation
 - properties
 - four limbs
 - a cuticle
 - follicles
 - dense
 - heat energy


 

      follicles   