Photosynthesis, Respiration, and Carbon/Nitrogen Cycle Crossword Puzzle

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Across
  1. 4. molecules that contain carbon
  2. 5. bacteria that can convert the ammonium to nitrates and nitrites
  3. 6. a source of carbon in the earth's crust that's formed from the remains of organisms that lived a long time ago
  4. 7. Nitrogen is fixed by these bacteria into a form of nitrogen known as ammonia and ammonium
  5. 8. part of the plant where respiration generally occurs
  6. 9. bacteria that converts nitrates and nitrites back into atmospheric nitrogen gas
  7. 13. the process by which decomposers return ammonia back into the soil when both plants and animals decompose
  8. 14. gas molecule in the atmosphere that's taken in by organisms that perform photosynthesis
  9. 16. part of the plant where photosynthesis generally occurs
Down
  1. 1. Reactant of photosynthesis that plants get through the ground
  2. 2. the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
  3. 3. the process by which cells use oxygen to break down sugar and obtain energy
  4. 10. organisms that use light energy from the sun to produce their own food
  5. 11. gasses in the atmosphere that trap heat and warm up the planet
  6. 12. organisms that cannot use the sun's energy to make food
  7. 15. energy rich molecule produced during cellular respiration for cells to do work