Answer:
1. the vertebrate has a distinct head, with a differentiated tubular brain and three pairs of sense organs ( nasal, optic, and otic ). the body is divided into trunk and tail regions. the presence of pharyngeal slits with gills indicates a relatively high metabolic rate.
2. Invertebrates are animals that neither possess nor develop a vertebral column, derived from the notochord. This includes all animals apart from the chordate subphylum Vertebrata. Familiar examples of invertebrates include arthropods, mollusks, annelid, and cnidarians.
