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

Fact 2: Eyes and skin are the critical organs.

Given the two facts above, answer the question "What are used for protecting the body from harmful substances?" with the following options: 
- critical organs
 - body critics
 - fur and fat
 - protective bony armor
 - redundant organs
 - layers of fat
 - sea urchins
 - solar waves


 

 critical organs        