Across
- 4. prevention of wasteful use of resource
- 6. gradual destruction of something
- 7. able to be maintained at a certain rate or level
- 8. process by which green plants use sunlight
- 9. cleaning a wide area of trees
- 11. a series of military operations to achieve a goal
Down
- 1. plant of a particular region or habitat
- 2. grassy plain in a tropical and subtropical region
- 3. complex network or interconnected system
- 5. spore-producing organisms feeding on organic matter
- 10. animal of a particular region or habitat