Across
- 2. Variety of life
- 4. Gases that surround our planet
- 5. Converting waste into usable materials
- 6. When no members of a species remain
- 7. To use items more than once
- 10. A group of organisms that can mate with each other
Down
- 1. To use less of something
- 3. Excessive use of natural materials
- 8. The surroundings of an organism(s)
- 9. Species in danger of extinction