Across
- 3. The genetic variation within species.
- 4. Resources: Materials provided by nature.
- 5. A biological community interacting with its environment.
- 8. A relationship where both parties benefit.
- 9. Contamination of the environment.
- 14. A relationship where one benefits at the expense of the other.
- 15. The variety of life on Earth.
- 17. When one species kills another for food.
- 18. At risk of extinction.
- 20. Related to medicine.
Down
- 1. No longer existing.
- 2. Relating to activities done for enjoyment.
- 6. A relationship where one benefits and the other is unaffected.
- 7. Species: Non-native species that cause harm to the environment.
- 10. The business of attracting, accommodating, and entertaining tourists.
- 11. The ability to maintain ecological processes over time.
- 12. Species compete for the same resource.
- 13. The rate at which ecosystems generate biomass.
- 16. Destruction: The process by which a natural habitat becomes incapable of supporting its native species.
- 19. The process by which soil and rock are removed from the Earth's surface.