In which group of vertebrates did jaws and a bony vertebral column arise? O fishes O reptiles O lancelets O amphibians
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This phylogenetic hypothesis shows the relationships among major clades of vertebrates. Derived characters are listed for some clades; for example, only gnathostomes have a jaw. In some lineages, derived traits have been lost over time or occur in reduced form; for example, hagfishes and lampreys are vertebrates with highly reduced vertebrae. Based on the phylogeny in the figure, which vertebrate group would have jaws and a mineralized skeleton, lungs or lung derivatives, and lobed fins but no limbs with digits? Tetrapoda Dipnoi Actinopterygii Chondrichthyes
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Osteichthyes is a group of fish that have the derived characteristics of jaws and true bones. Which letter corresponds to where Osteichthyes belongs on the cladogram?
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The first vertebrates to evolve were a. amphibians. d. reptiles. b. jawed fishes. e. amniotes. c. jawless fishes.
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