You are presented with the question "What do bighorns' hollow hairs do?" and the following answer choices: 
- It helps them survive
 - Plant growth is reduced
 - prevent heat loss
 - share properties
 - protect them
 - allow growth
 - Decrease bodily water
 - refract or absorb.

Now knowing that head hair is especially important in preventing heat loss from the body and bighorns have hollow hair that traps body heat, choose the best answer.


 

   prevent heat loss      