Fact 1: Head hair is especially important in preventing heat loss from the body.

Fact 2: Bighorns have hollow hair that traps body heat.

Given the two facts above, answer the question "What do bighorns' hollow hairs do?" with 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      