Summary:

  • Bacteria are the most diverse and abundant group of organisms on Earth.
  • They are found in the ocean, the soil, and the intestines of animals.
  • Any surface that has not been sterilized is likely to be covered with bacteria.
  • The total number of bacteria in the world is estimated to be 5 × 1030, or five million trillion.
  • You have more bacteria in and on your body than you have body cells!
  • You are bluish green in color because they contain chlorophyll (but not chloroplasts, of course)
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