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(arichnia) jointed feet, exoskeleton, and bilateral symmetry


(sponges) aquatic organisms, lack true tissues/organs, asymmetrical, sessile


( radially symmetrical, digestive cavity with one opening, most with tentacles and stinging cells, aquatic enviroments (ex. coral, sea anemone, jellyfish."


(roundworms) pseudocoelomate, unsegemented, bilaterally symmetrical, tubular digestive tract, without cilia, live in great numbers in soil and aquatic sediments. (ex. heartworms, hookworms.)


(flatworms) unsegmented, bilaterally symmetrical, no body cavity, if present, has one opening, parastic and free-living species. (ex. tapeworms, fluke.)


(segmented worms) coelomate, bilaterally symmetrical, serially segmented, complete digestive tact, setae on each segment, terrestrial and aquatic. (ex.leech, earthworm, polychete)


marine organisms, spiny or leathery skin, water vascular, system with tube feet, radially symmetrical. (ex. sea star, sea cucumber, sea urchin, sand dollar.)


soft bodied coelomates, body divided into 3 parts: head-foot, visceral mass, and mantle, many have sheels, almost all have a radula, aquatic/terrestrial (ex. snail, clam, slug, and squid)

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