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