Across
- 5. something relating to living organisms
- 6. interlocking food chains
- 8. the study of living things
- 9. gets something
- 10. makes something
- 12. things living in a certain area
- 13. living in a organism
- 15. neither organisms harm eachother
- 17. variation on earth
- 18. a place where someone or something lives in a group
Down
- 1. beginning of ecological systems
- 2. organisms in environment
- 3. more adapted in environment
- 4. used to identify organisms
- 7. secondary secession of a plants life
- 11. regions of the earth
- 14. physical not biological
- 16. symbiosis that helps both organisms