Fact 1: Scales are used for protection by scaled animals.

Fact 2: Fish are backboned aquatic animals.

Given the two facts above, answer the question "What are used for protection by fish?" with the following options: 
- scales
 - fins
 - streams.
 - coral
 - gills
 - Collagen
 - mussels
 - whiskers


 

 scales        