9.2

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Across
  1. 6. An echinoderm where radial symmetry is hard to see
  2. 8. An animal that does not have a backbone
  3. 9. A hard internal skeleton
  4. 10. Jointed limbs used for movement or feeding
  5. 12. Body parts arranged around a central point
  6. 15. Structures used by echinoderms for movement and feeding
  7. 16. Repeating body parts in annelids
  8. 17. A hard outer covering made by many mollusks
  9. 18. Tiny bristles that help some worms move
  10. 21. The phylum of roundworms
  11. 24. A skeleton made of fluid under pressure
  12. 28. The phylum that includes sponges
  13. 29. A tough outer layer that roundworms shed as they grow
  14. 31. Stinging structures used by cnidarians to capture prey
Down
  1. 1. The phylum that includes snails, clams, and octopuses
  2. 2. A flexible protein that supports some sponges
  3. 3. A tissue in mollusks that forms the shell
  4. 4. The process of shedding an outer covering
  5. 5. The phylum that includes sea stars and sea urchins
  6. 7. Arthropods with six legs
  7. 11. The phylum that includes flatworms
  8. 13. The phylum that includes insects, spiders, and crustaceans
  9. 14. A major change in body form during an animal’s life cycle
  10. 19. A hard outer covering that supports and protects arthropods
  11. 20. An organism that lives on or inside another organism and harms it
  12. 22. A hard material that makes up the skeleton of some sponges
  13. 23. Invertebrates that include jellyfish, corals, and sea anemones
  14. 25. Body parts that are mirror images on the left and right
  15. 26. A muscular structure used by mollusks for movement
  16. 27. FLUKE A parasitic flatworm that can infect humans
  17. 30. The phylum of segmented worms