Fact 1: Vertebrate chordates have a backbone.

Fact 2: Because reptiles are vertebrates, they are chordates.

Given the two facts above, answer the question "What has a backbone?" with the following options: 
- reptiles
 - four limbs
 - humans
 - the Sun
 - bacteria
 - insects
 - sponges
 - elephants


 

 reptiles        