What is the difference between vertebrates and invertebrates?

Vertebrates have a notochord or spinal column, while invertebrates do not.
Vertebrates have a segmented body, while invertebrates do not.
Vertebrates have an internal skeletal system, while invertebrates have an exoskeleton.
Vertebrates have closed circulation, while invertebrates have open circulation.
Vertebrates have lungs or gills for respiration, while invertebrates have gills or spiracles.