2 fish, 1 brain

1234567891011121314151617181920
Across
  1. 4. 250,000 fit into size of a period in your book
  2. 9. two flagella and lack skeleton
  3. 10. viruses that infect and destroy bacteria (two words)
  4. 11. star shaped internal skeleton made of silica
  5. 12. infect cells
  6. 14. massive calcareous mounds formed by cyanobacteria
  7. 16. used for cleaning swimming pools
  8. 17. responsible for many deadly human diseases
  9. 19. found in extreme environments
  10. 20. breaks down detritus as primary food source
Down
  1. 1. some carry out nitrogen fixation (two words)
  2. 2. known as blue-green algae
  3. 3. responsible for bioluminescent waves
  4. 5. spherical bacteria
  5. 6. considered protists with unicellular algae and multicellular seaweeds
  6. 7. dinoflagellates and planktonic forms of cyanobacteria produce this (two words)
  7. 8. protozoans with hair like cilia
  8. 13. smallest of true living organisms and oldest forms of life
  9. 15. spherical skeletons with radiating spines
  10. 18. rod shaped bacteria