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Across 2. Sand dollars and brittle stars are in this class. 4. Phylum that have a heart, nephridia, and sometimes, jaws. 7. Class that has slender legs much longer and slimmer than other sea stars and have a single set of orngans. 9. Phylum that is characterized by segmented bodies, jointed legs, and chitinous exoskeleton. 10. Includes feather start and sea lillies. 11. Sea Cucumbers. 12. Class that contains lobsters, shrimps, crabs and krill.

Down 1. Larvae fuses itself to substrates "upside down," using its legs to bring food into the mouth. 3. Organisms in this phylum share radially symmetrical body divided into five parts, most have hundreds of tiny tube feet to crawl and climb. 5. Includes Sea Stars. 6. Class that contains Tube worms, Bristle worms, Sponge worms, and Fire worms. 8. Class that plays a central role in food webs as primary and secondary consumers of Phytoplankton and Zooplankton.