You are presented with the question "What don't insects have?" and the following answer choices: 
- Sensory organs
 - Chlorophyll
 - exoskeleton
 - Energy.
 - Energy
 - nerves
 - backbones
 - antennae

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


 

       backbones  