Ian wells crossword

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