Fact 1: Invertebrates are animals that lack a vertebral column, or backbone.

Fact 2: Invertebrates are animals without backbones, and vertebrates are animals with backbones.

Given the two facts above, answer the question "what do vertebrates have?" with the following options: 
- tails
 - strength
 - eardrum
 - heart
 - brain
 - Chlorophyll
 - back bone
 - stamina


 

       back bone  