Finding disease with disease

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Across
  1. 3. spreading illness
  2. 7. organs
  3. 9. treat
  4. 12. difficulty
Down
  1. 1. 100 years
  2. 2. are a non-living collection of molecules
  3. 4. bacteria
  4. 5. function of an organism
  5. 6. help to prevent someone from getting a disease
  6. 8. time period
  7. 10. idea
  8. 11. way of doing things