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Gnathostomata: The Evolution of JawsA. The first gnathostomes wereand locomotion more efficient than those of...

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Gnathostomata: The Evolution of JawsA. The first gnathostomes wereand locomotion more efficient than those of their ancestors.fishes. Key derived traits made their feedingB. Jawed fishes first appeared in the Paleozoic era.1. Hinged jaws allow vertebrates to grasp, kill, shred, and crush large food items. Somespecies also use their jaws for defense, for grooming, to construct nests, and to transporttheir young.2. The origin of jaws and fins.a.b.Embryological evidence suggests that jaws evolved from paired gill arches in thepharynx of a jawless ancestorThe earliest fins were folds of skin and moveable spines that stabilized locomotionand deterred predators. By the Devonian period, most fishes had unpaired (dorsal,anal, and caudal) and paired (pectoral and pelvic) fins (

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