Across
- 5. Seriously at risk of extinction
- 7. The process by which a plant or animal community successively gives way to another until a stable climax is reached
- 12. The dependence of two or more people or things on each other
- 13. A particular set of organisms occupying a particular region
- 14. A large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra
- 16. The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms
- 18. When two or more organisms have an effect upon each other
- 19. An organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material
- 20. A community of organisms interacting in a physical environment
Down
- 1. A group of living organisms consisting of similar individuals capable of exchanging genes
- 2. Use or expend carelessly, extravagantly, or to no purpose
- 3. Creating usable materials out of waste
- 4. Make smaller or, lesser in amount
- 5. The surroundings or conditions in which a person, animal, or plant lives or operates
- 6. The fact or process of a species, family, or other group of animals or plants becoming extinct
- 8. A certain plant life occupying a particular region
- 9. An organism that derives the organic compounds and energy it needs from the consumption of other organisms
- 10. A substance that provides nourishment essential for growth and the maintenance of life
- 11. The natural home or environment of an animal, plant, or other organism
- 15. Use again or more than once
- 17. An organism that produces organic compounds from simple substances such as water and carbon dioxide