Microbiology

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Across
  1. 4. to the benefit of both
  2. 5. to the advantage of on , no harm/benefit to the other
  3. 6. before the nucleus
  4. 7. microorganisms that naturally live in or on the body
  5. 8. organism attached to a substrate by an extracellular matrix in complex layers
Down
  1. 1. invades host cells and causes harm
  2. 2. true nucleus
  3. 3. to live together in close association
  4. 4. can not be seen with the naked eye