Q: What do vertebrate chordates possess that invertebrate chordates do not?


Read this paragraph and choose the correct option from the provided answers:

Chordates include vertebrates and invertebrates that have a notochord. Chordates also have a post-anal tail, dorsal hollow nerve cord, and pharyngeal slits. Vertebrate chordates have a backbone, while invertebrate chordates do not. Invertebrate chordates include tunicates and lancelets; both are primitive marine organisms.

 Choices:

- parasite

- Thumb

- Milk production

- backbone


A:
backbone