BIO120H1 Study Guide - Final Guide: Marlin, Introduced Species, Swordfish
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BIO120H1 Full Course Notes
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Vertebrates sharks, boney fishes, amphibians, reptiles (including birds), and mammals animals that are not vertebrates are known as invertebrates (echinoderms, hemichordates, One of the tubes is open to the exterior where it meets the body wall, so seawater can flow into and out of the system. Inside, fluid move via the beating of cilia that line the interior of the tubes and chambers. Water vascular system forms a sophisticated hydrostatic skeleton. Podia are sections of the tube feet that project outside of the body and make contact with the substrate. As podia extend and contract, they alternately grab and release substrate. Endoskeleton: hard, supportive structure inside a thin layer of epidermal tissue. As individual develops, cells secrete plates of calcium carbonate inside the skin. Plates may remain independent and result in a flexible structure or fuse into a rigid case.
