Across
- 3. - seriously at risk for extinction
- 4. - tending to spread aggressively and harm other species.
- 5. - to become extinct; stop existing
- 7. - no longer in existence
- 8. - to destroy or remove completely
Down
- 1. - the action of conserving something, especially the environment
- 2. - the action of clearing a wide area of trees.
- 6. - to fell a tree