Nonvertebrate chordates, tunicates, and lancelets differ from other chordates in that

A) they do not have a notochord.
B) they have gills, while other chordates have lungs.
C) they do not have jaws, while all other chordates do have them.
D) the notochord of nonvertebrate chordates does not become a vertebral column.
E) nonvertebrate chordates do not have an internal bony skeleton, while all other chordates do.

Notochord

A flexible rod-shaped structure that provides support in the embryonic stages of all chordates, including humans.

Tunicates

Marine invertebrates, also known as sea squirts, that are part of the subphylum Tunicata, characterized by a tough outer tunic and filter-feeding mode of nutrition.

Lancelets

Small marine animals belonging to the subphylum Cephalochordata, characterized by their fish-like shape and a notochord extending the length of their body.