What is a single, hollow structure that runs just beneath the dorsal surface of chordates, and which differentiates into the brain and spinal cord in vertebrates?Multiple choice question.notochordnerve cordvertebral columnpharyngeal pouches

In what type of chordate is the spinal cord surrounded by a backbone composed of cartilage or bone?Multiple choice question.lanceletsvertebrateshagfishesurochordates

The structure that extends from the base of the brain through a large opening in the skull and proceeds inferiorly in the vertebral canal is the cord.

At some point in their life cycle, all chordates have a postanal tail, ______, hollow nerve cord, and ______.Multiple choice question.pharyngeal slits or pouches; endoskeleton made of bone or cartilagelungs; notochordnotochord; pharyngeal slits or pouchesendoskeleton made of bone or cartilage; lungs

Select the four distinguishing features that all chordates have at some time during their lives.Multiple select question.heart and lungsnotochordpostanal tailpharyngeal pouches or slitsvertebral column of cartilage or bonedorsal, hollow nerve cordcranium

Nervous tissue makes up most of which structures?Multiple select question.the spinal cordthe braincartilagenerves