Across
- 3. something that's overpopulated and harming the environment
- 4. when something benefits off another and they dont benefit at all with no harm
- 8. a source of pollutionthe is spread among environmental elements
- 9. a habitat after a major event
- 11. a living or once-living organism
- 12. an area where all organisms live together
- 14. when two different species work together
- 16. the world wide sum of all ecosystems
- 18. an identifiable source of pollution
- 19. a web of connections showing what things eat
- 20. something that takes without giving back
Down
- 1. when land is created or exposed for the first time
- 2. when an animal benefits from the expense of the other
- 5. when things adapt to the environment
- 6. the barrier of gasses around the earth
- 7. when things live together
- 10. the number of things living in an area
- 13. a non-living organism
- 15. the study of relationships between living organisms
- 17. something that gives food