Fact 1: Skin is used for protecting the body from harmful substances.

Fact 2: Sunlight, however, is harmful to the skin.

Given the two facts above, answer the question "what does skin protect from?" with the following options: 
- photons
 - cold air
 - electricity
 - forces
 - toxins
 - sunlight
 - heat energy
 - sun's heat


 

      sunlight   