You are presented with the question "Invertebrates are animals that lack a what?" and the following answer choices: 
- Chlorophyll
 - Epidermis
 - pair of legs
 - small bones
 - cartilage
 - an organism's body
 - support column
 - epidermal

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and all of the vertebral bodies act as a support column to hold up the spine, choose the best answer.


 

       support column  