Across
- 2. nonliving
- 6. organisms preying on each other
- 8. gets eaten by predators
- 9. living
- 13. first to colonize a land
- 14. going out of a land
- 16. number of organisms per area
- 17. relationship not harmful or helpful
- 18. progressive replacement of community
- 19. group of organisms in a location
- 20. something that constrains a pop.
Down
- 1. related organisms
- 3. coming into a land
- 4. harmful relationship
- 5. feeds on prey
- 7. org. interaction with the environment
- 10. total organisms inhabiting
- 11. the study of org. and the environemnt
- 12. mutually beneficial relationship
- 15. rivalry between organisms
- 18. relationship between two org.