Fact 1: Vertebrate chordates have a backbone.

Fact 2: Birds are a class of the chordates or vertebrate phylum.

Given the two facts above, answer the question "what have a backbone?" with the following options: 
- humans
 - clouds
 - jellyfish
 - birds
 - cats
 - invertebrates
 - dogs
 - toads


 

    birds     