Across
- 3. interactions
- 7. first colonize habitats
- 9. meeting the needs
- 12. stable
- 15. water
- 20. individual
- 22. number of steps from a food chain
- 23. different
- 25. produce food
- 26. dirt layers
- 27. classified area
- 29. variety
- 30. living
- 31. land-based
- 36. strong role
- 37. marine
- 38. increase
- 39. decompose material
- 40. relationship
- 41. animals that eat other animals
Down
- 1. exposed
- 2. helps hold a system together
- 4. food chains in a single ecosystem
- 5. constraints
- 6. organisms such as plants
- 8. fire/floods
- 10. number or quantity
- 11. species interact
- 13. variation of weather
- 14. work together
- 16. feeds on dead organic material
- 17. helps produce food
- 18. 2 bottom organisms of a food web
- 19. animals in a area
- 21. distinct layer of soil
- 24. diversity of ecosystems
- 28. clean air/water
- 32. non-living
- 33. top of food web
- 34. something that eats another thing
- 35. association between two organisms