You are presented with the question "what do vertebrates have?" and the following answer choices: 
- tails
 - strength
 - eardrum
 - heart
 - brain
 - Chlorophyll
 - back bone
 - stamina

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and invertebrates are animals without backbones, and vertebrates are animals with backbones, choose the best answer.


 

       back bone  