Invertebrates are animals that lack a vertebral column, or backbone.
Principal invertebrates are anostracans and ostracods.
Anostrans lack a vertebral column, or backbone.
What lacks a vertebral column, or backbone?
[1] fungi
[2] parasites
[3] cacti
[4] Leptospirosis
[5] insects
[6] bushes
[7] Conifers
[8] anostrans