You are presented with the question "What lacks a vertebral column, or backbone?" and the following answer choices: 
- fungi
 - parasites
 - cacti
 - Leptospirosis
 - insects
 - bushes
 - Conifers
 - anostrans

Now knowing that invertebrates are animals that lack a vertebral column, or backbone and principal invertebrates are anostracans and ostracods, choose the best answer.


 

        anostrans 