Mollusks and Annelids Crossword

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Across
  1. 1. Second-largest phylum of invertebrate animals that contain snails, octopuses, squid, and clams
  2. 5. The largest Mollusca phylum that contains slugs and snails
  3. 8. A shelled gastropod molluscs
  4. 9. The only cephalopod with a external shell
  5. 11. Segmented worms like earthworms, polychaetes, and leeches
  6. 12. A pair of muscular bristle appendages
  7. 13. Respiratory system of aquatic animals that extract oxygen from flowing water
  8. 15. A tube that allows for water to exit the mantle cavity of a bivalve
  9. 18. A soft and non-muscular region of a mollusc that contains body organs
  10. 20. Gastropods molluscs that do not have a shell
  11. 21. A body tissue that makes a shell
Down
  1. 2. Segmented parasitic or predatory worms in the phylum Annelida
  2. 3. Cells that produce color to create camouflage
  3. 4. A long slender appendage of an animal around the mouth or head of a animal
  4. 6. The segment of a aorta that helps distribute blood to the head and upper extremities
  5. 7. Predatory mullusk such as squid and octopus
  6. 10. A Cephalopod mollusk with ten arms and tail fins
  7. 14. Bristles that allow for movement
  8. 16. A structure of tiny teeth used for scraping food particles off a surface to go into the mouth
  9. 17. A tube that allows entrance for water containing food and oxygen
  10. 19. Mollusks that have two shells held together by hinges and strong muscles