Science

4. used in the process of sewage treatment
5. spiral-shaped bacteria
10. an organism that uses oxygen to break down food
12. what causes diseases
14. using organisms to help clean up or remove environmental pollutants
16. a process that produces two new cells
17. changing nitrogen from the air into forms that plants and animals can use
18. consumer bacteria that help maintain nature's balance
19. can be made from damaged particles taken from bacterial cell walls or from killed bacteria

1. a one - or many - celled organism that lives in moist or wet surroundings
2. any organism that causes disease
3. a process of heating food to a temperature that kills the most harmful bacteria but causes little change to the taste of the food
6. exist in many shapes and sizes and are found in freshwater and saltwater
7. found in freshwater and saltwater and secrete glass-like boxes around themselves
8. sphere-shaped bacteria
9. whip-like tails to help bacteria move
10. chemicals that limit the growth of other bacteria
11. rod-shaped bacteria
13. an organism that is adapted to live without oxygen
15. poisonous substances