You are presented with the question "What are found in skin?" and the following answer choices: 
- cell walls
 - parasites
 - dust
 - layers of fat
 - Veins and arteries.
 - free nerve endings
 - it keeps an organism warm
 - ice

Now knowing that pressure receptors are found mainly in the skin and all pain receptors are free nerve endings, choose the best answer.


 

      free nerve endings   