Across
- 5. Harmful materials being released into an ecosystem
- 7. A characteristic that remains constant in an organism
- 8. The variety of life in an environment
Down
- 1. The amount of time something is expected to live
- 2. The act of an organism concealing itself in its surrounding
- 3. The non-living space surrounding an organism
- 4. The weather and condition of an environment
- 6. The state of a species being entirely dead or no longer existent