Fact 1: Vertebrates are all chordates that have a backbone.

Fact 2: Invertebrates are animals who lack a backbone or spinal column.

Given the two facts above, answer the question "What do all vertebrates have that invertebrates don't?" with the following options: 
- sensory neurons
 - fur and fat
 - bones and joints
 - a jaw bone
 - kinetic energy
 - Chemical energy
 - a spinal column
 - a set of gills


 

       a spinal column  