Bio means life

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Across
  1. 3. – The biochemical emission of light by living organisms, such as fireflies.
  2. 5. – The variety of life in the world or in a particular habitat or ecosystem.
  3. 6. – A mutually beneficial relationship between two different living organisms.
  4. 8. – A large naturally occurring community of flora and fauna occupying a major habitat (e.g., forest or tundra).
Down
  1. 1. – An examination of tissue removed from a living body to discover the presence, cause, or extent of a disease.
  2. 2. – A medicine that inhibits the growth of or destroys microorganisms.
  3. 3. – The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
  4. 4. – The total quantity or weight of organisms in a given area or volume.
  5. 5. – An account of a person's life written by someone else.
  6. 7. – The scientific study of living organisms.