Across
- 3. living
- 4. comes from decaying plants
- 5. place to grow plants
- 7. needs it to survive
- 9. control pest
- 11. pollutant from gas engines
- 12. from your parents
- 14. breath
- 18. plats also produce
- 19. genetic makeup
- 20. atmosphere
Down
- 1. plants and animals
- 2. square
- 6. where animals and humans live
- 8. radiation
- 10. smoke or dust clouds
- 13. plants produce it
- 15. physical looks
- 16. living organisms
- 17. you breath it