Invertebrate Crossword Puzzle

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Across
  1. 6. Segmented worms like earthworms
  2. 10. Roundworms
  3. 11. Marine animals with spiny skin
  4. 13. Body captivity found in complex animals
  5. 14. Body divided into repeating sections
  6. 16. Hard outer covering of arthropods
  7. 17. Body plan with parts arranged around a center
  8. 19. Early stage in an animal's life cycle
  9. 20. Stinging cell animals like jellyfish
Down
  1. 1. Simple animals like sponges
  2. 2. Platyhelminth
  3. 3. Needle-like structures in sponges
  4. 4. Animal without a backbone
  5. 5. Process of shedding an exoskeleton
  6. 7. Organ used by mollusks to scrape food
  7. 8. Group including squid and octopus
  8. 9. Appendages used for grabbing or sensing
  9. 12. Body plan with left and right sides
  10. 15. Soft-bodied animals often with shells
  11. 18. Animals with jointed legs and segmented bodies