Clams

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Across
  1. 2. The internal mass containing organs like the stomach and gonads
  2. 7. Juvenile clams often show these colored bands
  3. 8. Bands or rings on the shell that show growth
  4. 10. Opening that expels filtered water and waste
  5. 14. The main organ of a clam's excretory system
  6. 15. The two-part shell of a clam
  7. 17. Free-swimming larvae stage of the clam's life cycle
  8. 19. Used for food sorting prior to entering the mouth
  9. 20. Feeding method where clams strain particles from water
Down
  1. 1. Attachment point for muscles that retract the siphons
  2. 3. What clam's begin their life as
  3. 4. Opening that draws water into the clam
  4. 5. Where the mantle attaches to the shell
  5. 6. Structure used for digging and movement
  6. 9. Organ that filters food from the water
  7. 11. Oldest part of the clam shell, centrally located
  8. 12. Muscles that close the shell tightly
  9. 13. Reproductive strategy where eggs and sperm are released into the water
  10. 16. Soft tissue that lines the inside of the shell and secretes shell material
  11. 18. Stage of life cycle where foot develops