1 A) Mollusks range from microscopic to huge and exhibit many different forms. B) They all have a coelom surrounding the heart. C) The mollusk body plan is relatively simple and static. D) Mollusks are generally bilaterally symmetrical, at least at some point in their lives. E) They use a muscular foot (podium) for locomotion, attachment, food capture, or a combination. 2 A) nephridia B) cnidocytes C) choanocytes D) kidneys E) trachea 3 A) nephridia B) coelom C) zoecium D) lophophore E) tagma 4 A) Class Chelicerata B) Class Crustacea C) Class Hexapoda D) Class Myriapoda E) These are all classes of arthropods. 5 A) Echinoderms are a relatively recent lineage. B) Echinoderms are characterized by deuterostome development, pentameral symmetry, an endoskeleton covered by a delicate epidermis, and a water-vascular system. C) Echinoderm symmetry is lacking in larvae and bilateral in adults. D) The water-vascular system is the only coelomic compartment E) The four classes of echinoderms are Chelicerata, Crustacea, Hexapoda, and Myriapoda.
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