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

Fact 2: Principal invertebrates are anostracans and ostracods.

Given the two facts above, answer the question "What lacks a vertebral column, or backbone?" with the following options: 
- fungi
 - parasites
 - cacti
 - Leptospirosis
 - insects
 - bushes
 - Conifers
 - anostrans


 

        anostrans 