Across
- 2. movement of nitrogen
- 3. respiration with oxygen
- 4. what we breath
- 6. what plants make for food
- 9. high to low concentration
- 12. transport that uses energy
- 15. carbon ____ is amount of carbon produced
- 17. global ____ makes the world warmer
- 18. how plants make food
- 19. transport that needs no energy
- 20. dioxide
Down
- 1. respiration without oxygen
- 5. ____ effect traps heat in atmosphere
- 7. natural movement of water
- 8. ____ change is a change in weather over time
- 10. ____ cycle (precipitation)
- 11. cellular _____ makes energy for body
- 13. ____ cycle is movement of phosphorous
- 14. cellular energy
- 16. ____ membrane protects the cell