Across
- 1. factory smoke
- 7. living organisms adapt and change
- 8. one organism benefits
- 11. system of relating food chains
- 13. relating or resulting from living things
- 14. omnivores,carnivores,herbivores&decomposers
- 16. life, sphere
- 17. temperature, light, and water or nonliving
- 20. contaminent on the ground
- 21. scientific tool
Down
- 2. habitat after major changes
- 3. organisms and the physical environment
- 4. gasses around the earth
- 5. new patch of land is created
- 6. a body of organisms
- 9. introduced species
- 10. green plant
- 12. the number of organisms in an environment
- 15. one benefits at the expense of the other
- 18. the study of living things
- 19. symbiosis beneficial to both organisms