Across
- 2. A producer (plants & algae) that make their own food
- 3. These organisms have symbiotic relationships with plants to help fix nitrogen
- 5. Plants absorb nitrogen in this form
- 8. Natural process that keeps Earth warm and livable
- 11. The main greenhouse gas
- 12. Two species living in close association with each other
- 14. Toxins become more concentrated in animals in higher trophic levels
- 15. Man-made problem making the Earth too warm
- 16. A consumer that must eat other organisms
- 17. Eat animals only
- 19. Eat only dead animals
- 21. Process by which plants remove carbon from the air to form glucose
- 23. An organism's role (job) where it lives
- 24. The study of how living things fit in with their environment
- 25. Eat both plants and animals
- 26. Exhaling, putting carbon dioxide back into the air
- 27. Burning these (like coal or oil) contributes to global warming
Down
- 1. A symbiotic relationship in which one organism harms another
- 4. What percent of energy is passed on to the next trophic level?
- 6. Cutting down trees
- 7. Where an organism lives
- 9. Largest population the environment can support
- 10. This is killed and eaten by a predator
- 13. A symbiotic relationship in which both species benefit
- 16. Eat plants only
- 18. Break down and recycle dead organisms
- 20. Occurs between organisms with similar niches living in the same area
- 22. When the population grows faster and faster (J-curve)