Across
- 2. when an animal eats poison and it gets worse and worse as it passes down the food chain
- 6. when nitrogen oxide gets mixed with sunlight it makes this
- 8. bacteria is an example of this
- 9. an example of this is the ozone
- 10. this can very harmful to the human respiratory system
Down
- 1. benzene is an example of this
- 3. this traps heat
- 4. Amphibians are considered the best type of this species
- 5. carbon monoxide is an example of this
- 7. a factory releasing smoke