Across
- 2. Increasing substance concentration
- 4. curve Graph of survival rates
- 6. Interacting species in an area
- 10. resource Can't be easily replaced
- 13. factor Restricts population growth
- 14. density Number of individuals per area
- 15. Close ecological relationships
- 17. species First to colonize a habitat
- 18. resource Replenishes naturally
- 21. footprint Impact on the environment
- 23. Movement into a population
- 24. Needs external food source
- 26. Variety of life in a habitat
- 29. factory Non-living parts of an ecosystem
- 32. Eats other organisms
- 34. capacity Maximum sustainable population size
- 35. Study of environment and organisms
- 36. One benefits at the other's expense
Down
- 1. Introduction of harmful substances
- 2. Total mass of living organisms
- 3. Organisms and their environment
- 5. web Complex network of feeding interactions
- 7. pyramid Shows energy flow in an ecosystem
- 8. species Disproportionate environmental impact
- 9. Long-term weather pattern
- 11. niche Role of an organism in its environment
- 12. Both species benefit
- 16. Breaks down dead organisms
- 19. Natural environment of an organism
- 20. Large community of flora and fauna
- 21. Movement out of a population
- 22. Produces its own food
- 25. factor Living components of an ecosystem
- 26. cycle Movement of elements in the environment
- 27. succession After disturbance or destruction
- 28. Makes its own food
- 30. level Position in a food chain
- 31. succession Begins in lifeless areas
- 33. One benefits, the other is unaffected