You are presented with the question "What do insects lack?" and the following answer choices: 
- sensory neurons
 - the body's largest organ
 - a vertebral column
 - wings
 - legs
 - Chlorophyll
 - a cuticle
 - reproductive system

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and insects are the most common invertebrates, choose the best answer.


 

   a vertebral column      