Question

The fish, dog, and bird are

Answer 1

D.) backbones
Fish don't have legs nor hair nor lungs (they have fins,scales,and gills)
Though all of them do have backbones

Answer 2

D. Backbones.

All of the animals listed are vertebrae, a classification of animals that means they have backbones. Fish do not have legs, lungs, or hair, and birds lack hair as well.