Cyanobacteria

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Across
  1. 4. a gas that is part of all living things, and 78% of Earth’s atmosphere
  2. 5. the smallest unit a substance can be
  3. 6. the person or thing before another
  4. 8. a chemical in plants that changes sunlight into food
  5. 10. to break something into smaller part that it is made of
  6. 11. use
  7. 12. a kind of bacteria that gets energy from the sun
  8. 15. join together into one thing
  9. 16. a single living plant, animal, virus, etc.
  10. 17. bacteria that can absorb nitrogen from the air and change it into a form that plants can use for food
  11. 18. existing at the beginning of the world
  12. 20. needing something or someone
  13. 22. to keep something going, support
Down
  1. 1. good for growing plants
  2. 2. to make soil good for growing plants
  3. 3. a substance of two or more elements
  4. 6. the process plants use to change sunlight into food
  5. 7. slime
  6. 9. to take in a liquid, gas, or chemical
  7. 11. finally; lastly
  8. 13. the part of a plant containing chlorophyll
  9. 14. something made as a result of something else
  10. 19. a field for growing rice
  11. 21. use to survive