You are presented with the question "Many animals that lack a vertebral column, or backbone have a what" and the following answer choices: 
- spine
 - exoskeleton
 - parasites
 - Leptospirosis
 - epidermal
 - Damaged hearing
 - skeleton
 - hip bone

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and many invertebrates have an exoskeleton, choose the best answer.


 

  exoskeleton       