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

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

Which of the following is a cord-like structure formed from fibrous connective tissue that connects bones together?Multiple choice question.CartilageLigamentMuscleTendon

3. In most chordates, what does the notochord become?the brainthe appendagesthe backbonethe spinal cord

In chordates called vertebrates, the notochord is replaced by the ______ during development.Multiple choice question.spinal cordbackbonelong nerves of the back and legscranium

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