Question

hagfish, a member of phylum chordata, are the only living organism that does not have a head, skull, or vertebral column. however, hagfish do have which of these features? some jaws a notochord a face an arm

Explanation:

Hagfish belong to Phylum Chordata. A key characteristic of chordates is having a notochord (at some stage of life). Hagfish lack jaws, a distinct face, or arms. So the correct feature they have is a notochord.

Answer:

B. a notochord