Plankton

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Across
  1. 3. action of their heart and circulatory system can be seen through their transparent bodies
  2. 4. veligers
  3. 5. a pillbox shape
  4. 6. jellyfish but are not classified as jellyfish
  5. 7. bell-like protozoans
  6. 8. powerful, even deadly, stings
  7. 9. internal skeletons made of silica
  8. 12. that voraciously prey on other zooplankton
  9. 14. have long glasslike spines
  10. 15. a chalky, calcareous outer skeleton
  11. 16. dense blooms called "red tides"
  12. 17. called sea butterflies
  13. 18. shrimp, slipper lobsters, crabs, and barnacles
  14. 20. for the largest of all animals, the blue whale
Down
  1. 1. not usually look like adult fish
  2. 2. called blue-green algae
  3. 6. zooplankton
  4. 10. organisms embedded in a gelatinous material
  5. 11. sea stars, sea urchins, sand dollars, brittle stars, and sea cucumbers
  6. 13. ribbon worms, flatworms, and sipunculid worms
  7. 19. most abundant of zooplankton