Chapter 4 Review Crossword

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