Chapter 22- The Parade of Vertebrates. Kingdom Animalia Phylum Chordata Subphylum Vertebrata Fishes (jawless and jawed) Amphibians Reptiles Birds Mammals. The Vertebrate Family Tree. Fishes Dominate the Sea. Fishes constitute about half of all vertebrates
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The Vertebrate Family Tree
Red-eyed tree frog
amphibians exist today
Fig. 22.15 Evolution of legs
Incisors serve as specialized weapons