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

Fact 2: Some receptors are free nerve endings.

Given the two facts above, answer the question "Where can free nerve endings be found?" with the following options: 
- eardrum
 - Localized damage
 - on the Sun
 - mouth of rivers
 - in the skin
 - heat or cold
 - in the fingernails
 - in bacteria


 

     in the skin    