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

Fact 2: Insects are the most common invertebrates.

Given the two facts above, answer the question "What don't insects have?" with the following options: 
- Sensory organs
 - Chlorophyll
 - exoskeleton
 - Energy.
 - Energy
 - nerves
 - backbones
 - antennae


 

       backbones  