Across
- 2. trash in public places
- 5. decayed organic material
- 6. maintain something in its current state
- 7. gases that surround Earth
- 9. a place to put trash
Down
- 1. the home of plants and animals
- 3. a community of interacting organisms and their environment
- 4. reuse and change in a way that increases value or quality
- 5. protect
- 8. the study of organisms and how they relate to each other