Oxygen-Carbon Dioxide Cycle

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Across
  1. 2. are plants and animals connected through the CO2/O2 cycle
  2. 3. helps keep the Earth warm
  3. 6. take in oxygen
  4. 9. need oxygen to survive
  5. 10. used by animals underwater to breathe
  6. 12. plants use carbon dioxide for this
  7. 13. another word for respiration
  8. 14. need oxygen to survive
  9. 15. balances out CO2
  10. 16. how plants take in carbon dioxide from the water
Down
  1. 1. when plants and animals die
  2. 4. a waste product given off during photosynthesis
  3. 5. how gases move through leaves of a plant
  4. 7. breathe out carbon dioxide
  5. 8. burning plants, trees, or fossil fuels
  6. 11. may happen with an unhealthy balance of CO2