Invertebrates are animals that lack a vertebral column, or backbone.
Fish are backboned aquatic animals.
Fish are aquatic animals that do not lack a vertebral column.
Fish are aquatic animals that do not lack a what?
[1] the body's largest organ
[2] furry hide
[3] vertebral column
[4] critical organs
[5] thumbs
[6] aqua lungs
[7] salt and water.
[8] Chlorophyll