Chordates - member of the phylum Chordata; animal that has, for at least some stage of its life, a dorsal, hallow nerve cord; a notochord; pharyngeal pouches; and a muscular tail
Notochord - long supporting rod that runs through a chordate's body just below the nerve cord
Pharyngeal pouches - one of a pair of structures in the throat (pharynx) region of a chordate
Vertebrae - animal that has a vertebral column or backbone
Fish - aquatic vertebrate characterized by paired fins, scales and gills
Cartilage - strong connective tissue that supports the body and is softer and more flexible than bone
Amphibian - vertebrate that, with some exceptions, lives in water as a larva and on land as an adult, breathes with lungs as an adult, and has moist skin that contains mucus glands and lacks scales and claws.
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