You are presented with the question "What is a form of natural insulation that humans have?" and the following answer choices: 
- fur and fat
 - Fire
 - Blankets
 - Animal fur
 - Head hair
 - layers of fat
 - Clothes
 - copper

Now knowing that head hair is especially important in preventing heat loss from the body and insulation serves to both prevent heat loss in the winter and heat gain in the summer, choose the best answer.


 

     Head hair    