Invertebrates are animals that lack a vertebral column, or backbone, and principal invertebrates are anostracans and ostracods. Given these facts, what lacks a vertebral column, or backbone among the following options:
- fungi
 - parasites
 - cacti
 - Leptospirosis
 - insects
 - bushes
 - Conifers
 - anostrans


 

        anostrans 