Fact 1: Pressure receptors are found mainly in the skin.

Fact 2: All pain receptors are free nerve endings.

Given the two facts above, answer the question "What are found in skin?" with the following options: 
- cell walls
 - parasites
 - dust
 - layers of fat
 - Veins and arteries.
 - free nerve endings
 - it keeps an organism warm
 - ice


 

      free nerve endings   