Fact 1: Hair is a fiber that is found only in mammals.

Fact 2: Mammals are vertebrates with fur or hair.

Given the two facts above, answer the question "What are mammals?" with the following options: 
- dinosaurs
 - animals
 - fish
 - Animal survival
 - supersonic
 - vertebrates
 - invertabrates
 - four limbs


 

      vertebrates   