'Agnatha jawless fish' diaporamas de présentation

Zoology Review

Zoology Review. Chordates all have a ________________ at some point of their lives that may become modified into the vertebral backbone in higher vertebrates. a. dorsal nerve chord b. pharyngeal pouches c. notochord.

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Ichthyes: The Fish

Ichthyes: The Fish. What is a Fish? Aquatic vertebrate, usually with paired fins, scales and gills. -fins for movement -scales for protection -gills for respiration -Very diverse group composed of many classes of fish. -. Evolution of Fish -Fish were the first vertebrates

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