Across
- 1. the amount of hydrogen.
- 4. non-living feature
- 6. runoff from storm.
- 8. a living organism that indicates health.
- 9. when 2 animals live in the same area.
Down
- 1. a hunter
- 2. type of water pollution
- 3. a type of water pollution.
- 5. an animal that gets eaten
- 7. How clear the water is.
- 10. a symbiosis relationship