Invertebrates are animals that lack a vertebral column, or backbone.
Millipedes, spiders and other invertebrates are probably taken as well.
Millipedes lack a vertebral column.
Millipedes lack what?
[1] epidermal
[2] segmented body
[3] leg pairs
[4] a cuticle
[5] a vertebral column
[6] diplosomites
[7] Chlorophyll
[8] biological diversity