Veterinary ecology

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Across
  1. 4. plants that have no roots, stems, or leaves and grow in water
  2. 5. an official rule that controls the way that things are done
  3. 6. the proces of changing into gas or steam
  4. 8. the type of weather that a country or region has
  5. 9. microorganisms consisting of a single cell
  6. 13. solid waste from farm animals
  7. 14. something that could be dangerous
  8. 15. a common small insect with wings
  9. 16. a process in which a substance is put on something
  10. 17. firm and hard
  11. 18. the useless materials, or substances left after you use something
Down
  1. 1. an artificial pool for waste water
  2. 2. a substance such as air that is neither a solid nor a liquid
  3. 3. a natural or chemical substance added to soil to help plants grow
  4. 7. a substance that is harmful to the environment
  5. 9. to put animal's dead body in the ground
  6. 10. a mixture of decaying plants and vegetables
  7. 11. a poisonous gas with a strong unpleasant smell
  8. 12. connected with, produced by, or obtained from living things
  9. 19. farm animals