Question

multiple select question
select all that apply
select all the features present in tunicates and lancelets at some point in their life.
notochord
pharyngeal slits
dorsal nerve cord
cranium
vertebral column

Explanation:

Tunicates (subphylum Urochordata) and lancelets (subphylum Cephalochordata) are invertebrates within the phylum Chordata. Chordates have four key features at some stage of their life - a notochord (a flexible rod - like structure), pharyngeal slits (openings in the pharynx), and a dorsal nerve cord (a hollow nerve cord). Tunicates have these features in their larval stage, and lancelets have them throughout their life. They do not have a cranium (a bony or cartilaginous structure that encloses the brain, which is a feature of vertebrates) or a vertebral column (another vertebrate feature).

Answer:

notochord, pharyngeal slits, dorsal nerve cord