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

Fact 2: All of the vertebral bodies act as a support column to hold up the spine.

Given the two facts above, answer the question "Invertebrates are animals that lack a what?" with the following options: 
- Chlorophyll
 - Epidermis
 - pair of legs
 - small bones
 - cartilage
 - an organism's body
 - support column
 - epidermal


 

       support column  