Microbes Crossword Puzzle

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Across
  1. 5. - an organism that makes its own energy from chemical compounds
  2. 6. - Contain chlorophyll and make their own organic compounds
  3. 11. - single cell aquatic form that photosynthesizes
  4. 14. - Massive mounds that are 3 billion years old
  5. 15. - the process of converting Nitrogen gas to Ammonium
  6. 17. - reproduces by infecting living cells
  7. 18. - unicellular organism with armor plated cell wall and a light-sensing eye spot
  8. 19. - Spherical, spiral, or rod-shaped cells that are the most primitive life forms on Earth
  9. 20. - Have two flagella and lack a skeleton
Down
  1. 1. - marine protozoans with calcium carbonate shell
  2. 2. - unicellular chain or star-like groups enclosed in silica cell walls
  3. 3. - about 250,000 fit into the size of a period in your book
  4. 4. - paramecium is an example of this
  5. 7. - smallest of true living organisms and oldest forms of life
  6. 8. - algae with a silica star-shaped internal skeleton
  7. 9. - There is disagreement on how to classify these Eukaryotic organisms
  8. 10. - spherical unicellular organism of calcium carbonate
  9. 12. - marine protozoans that secrete glass skeletons
  10. 13. - obtains energy from organic matter by respiration
  11. 16. - Also known as blue-green algae