The 15 words of science

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Across
  1. 3. dealing with viruses and one-celled organisms
  2. 4. Spreading rapidly to a great many individuals in a locality
  3. 7. Tiny reproductive body consisting of one or more cells
  4. 9. A natural process of evolution
  5. 12. Any of the simplest forms of animal life
  6. 13. An abnormal physical or mental condition
Down
  1. 1. Any large group of submicroscopic agents that reproduce only in living cells
  2. 2. science concerned with promoting health and preventing illness
  3. 3. Any microscopic life form such as a bacterium, protozoan, or virus
  4. 5. Any organism that causes disease
  5. 6. An animal or plant that live in or on another organism and drains sustenance from it
  6. 8. A specimen of modified, killed, or avirulent viruses or bacteria
  7. 10. Various substances derived from fungi or other organisms
  8. 11. The child, young, or descendant of a particular parent or ancestor