Across
- 3. an abandoned industrial area
- 8. earth system which includes all life
- 9. several species together in a location
- 11. all members of a species in a location
- 13. when all members of a species have died
- 14. environment where a species lives
- 15. system of communities and their environment
- 18. species a species which has lost enough to be under a threshold where it may not recover
- 19. vehicle a vehicle with two or more power sources
- 20. role played by organism in a community
Down
- 1. where all precipitation of an area drains
- 2. three oxygen atoms bound
- 4. community with its environment
- 5. cell a hydrogen fuel system
- 6. all members of a species are dead in an area but still exist on Earth
- 7. relationship of mutual benefit
- 9. planned management to prevent loss
- 10. where all prevailing winds carry weather systems
- 12. prevention attempting to keep a resource from being contaminated
- 16. species a species with more loss than births per year
- 17. source when you cannot say exactly where pollution was introduced