The fish, dog, and bird are

alike in many ways. One way

is that they all have -

A legs

B hair

C lungs

D backbones

D.) backbones

Fish don't have legs nor hair nor lungs (they have fins, scales, and gills)

Though all of them do have backbones

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.