Answer:
The correct answer is option D, that is, all of the above.
Explanation:
Vertebrata refers to the subphylum of Chordata, which is further illustrated by their bony backbone. Vertebrates comprise the members of the subphylum Vertebrata, which comes under the kingdom Animalia and under the phylum Chordata.
The following are the characteristics of Vertebrates:
1. Developed brain.
2. Existence of an internal skeleton.
3. Presence of muscles, which helps in movement.
4. The existence of an advanced nervous system associated with the brain.
5. Circulation of blood in the bodies via vessels.
6. Protective skin.
Hence, the correct answer is option D, that is, all of the above.