Head hair is especially important in preventing heat loss from the body, and bighorns have hollow hair that traps body heat. Given these facts, what do bighorns' hollow hairs do among the following options:
- It helps them survive
 - Plant growth is reduced
 - prevent heat loss
 - share properties
 - protect them
 - allow growth
 - Decrease bodily water
 - refract or absorb.


 

   prevent heat loss      