Science

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Across
  1. 2. a process that produces two new cells
  2. 4. used in the process of sewage treatment
  3. 5. spiral-shaped bacteria
  4. 7. chemicals that limit the growth of other bacteria
  5. 10. rod-shaped bacteria
  6. 13. any organism that causes disease
  7. 15. an organism that is adapted to live without oxygen
  8. 17. a process of heating food to a temperature that kills the most harmful bacteria but causes little change to the taste of the food
  9. 20. what causes diseases
Down
  1. 1. changing nitrogen from the air into forms that plants and animals can use
  2. 3. a one - or many - celled organism that lives in moist or wet surroundings
  3. 6. consumer bacteria that help maintain nature's balance
  4. 8. poisonous substances
  5. 9. sphere-shaped bacteria
  6. 11. using organisms to help clean up or remove environmental pollutants
  7. 12. found in freshwater and saltwater and secrete glass-like boxes around themselves
  8. 14. exist in many shapes and sizes and are found in freshwater and saltwater
  9. 16. whip-like tails to help bacteria move
  10. 18. can be made from damaged particles taken from bacterial cell walls or from killed bacteria
  11. 19. an organism that uses oxygen to break down food