9.1

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Across
  1. 2. – Tiny single-celled organisms, some cause diseases while others are useful.
  2. 4. – A milk product made by bacterial fermentation.
  3. 6. – The smallest germ that can only live and multiply inside living cells.
  4. 8. – A chemical used to kill harmful insects on crops.
  5. 9. – Fuel made from decayed animal and plant waste.
  6. 11. – A substance that protects the body from diseases.
  7. 12. – The process by which microorganisms produce energy without oxygen; used in making bread and yogurt.
Down
  1. 1. – Decayed organic matter used as fertilizer.
  2. 3. – Medicine used to kill or stop harmful bacteria.
  3. 5. – Organisms such as molds and mushrooms that feed on dead matter.
  4. 7. – The breaking down of dead plants and animals into simpler substances.
  5. 10. – A microorganism that causes disease.