CHAPTER 14 FISH, AMPHIBIANS, AND REPTILES p. 394.
Phylum Chordata Subphyla Invertebrata & Vertebrata from sea otters to sea squirts.
12345 A cladogram shows that all chordates evolved from 1.tunicates and lancelets. 2.dinosaur ancestors. 3.fishes. 4.a common ancestor.
Chordates Notocord Dorsal hollow nerve cord Gills Postanal tail.
