Across
- 2. Greenhouse gas; largely produced by cattle
- 4. Coal, Oil, Gas
- 6. Matter that always contains Carbon and Hydrogen
- 9. For structure and body functions
- 11. Respiration that uses oxygen
- 12. Respiration in the absence of oxygen
- 13. Glucose and Oxygen are reactants
- 15. Chemicals that an organism must have to live and grow
- 20. Carbohydrates and oxygen are byproducts
- 21. Key element for all living things
Down
- 1. Process that converts ammonium and nitrate back to N2
- 3. Greenhouse gases raise the global ___________
- 5. Not of biological origin
- 7. Carbon comp. that are eaten for usable energy (ex. sugar)
- 8. Store and release carbon slowly
- 10. Nitrogen gas is "fixed" with hydrogen to produce this
- 14. Energy molecule with three phosphate groups
- 16. Produced by nitrification
- 17. Most abundant element in the air
- 18. Increases the solubility of phosphate
- 19. Plants with nitrogen-fixing bacteria in their roots