Across
- 1. a group of organisms interacting with their environment as a unit
- 3. a source of CFCs
- 4. a close relationship between 2 organisms of different species in which at least one of them benefit
- 7. pollution that occurs on farms
- 9. members of the same species living in an area
- 10. pollution that occurs from factories
- 12. addition of nutrients to fresh water
- 14. Liquefied waste material produced by animals
- 15. non-living factors
Down
- 2. a pollutant that causes ozone depletion
- 5. any harmful addition to the environment
- 6. the act of one organism killing another organism for food
- 8. an organism that feeds on a host, causing harm
- 11. pollution made in the home
- 13. Careful management of natural resources to protect the environment