Invertebrates are animals that lack a vertebral column, or backbone, and many invertebrates have an exoskeleton. Given these facts, many animals that lack a vertebral column, or backbone have a what among the following options:
- spine
 - exoskeleton
 - parasites
 - Leptospirosis
 - epidermal
 - Damaged hearing
 - skeleton
 - hip bone


 

  exoskeleton       