Like chordates, all invertebrates have

a. tails.

b. eukaryotic cells.

c. backbones.

d. pharyngeal pouches.

I just took the test and the correct answer is B. eukaryotic cells

I believe that the question asks for vertebrates, not invertebrates. Invertebrates do not have backbones whereas vertebrates have backbones. Invertebrates are multicellular, they have numerous cells for the organism to function. They have no cell walls because they are part of the animal kingdom. Invertebrates are heterotrophic meaning they need another source of energy in order to survive. Examples of invertebrates are sponges. Chordate, which means it has a backbone, belongs to the vertebrate group. So the answer is letter C.