Across
- 2. all living or once living factors
- 6. water in plants evaporates into the atmosphere
- 7. all populations living in an area;all living things
- 9. all parts of Earth where life exists in water, land, and air
- 12. all members of same species living in the same area
- 13. many interconnecting chains
- 14. a single living thing
- 15. bacteria turn soil nitrates back into nitrogen gas
- 17. nitrogen fixing bacteria or lightening change nitrogen gas into usable forms for plants
- 18. water vapor turns into liquid water
- 20. autotrophs that make their own food
Down
- 1. liquid water becomes water vapor
- 3. forms of water that fall from clouds in the sky
- 4. heterotrophs that eat food
- 5. burning coal and oil and add CO2 into the air
- 8. releases nitrogen back into the environment by breaking down dead matter
- 10. 1 feeding option
- 11. nonliving factors
- 16. a large area that shares similar climate, plants, and animals
- 19. all living and nonliving factors in an area