Plants and Animal's Gas exchange

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Across
  1. 2. Oxygen carrier in animal red blood cells.
  2. 6. Gas movement from high to low concentration (plants & animals).
  3. 9. Uses oxygen for energy (releases CO2 - plants & animals).
  4. 11. Plant leaf pores for gas exchange (oxygen & CO2).
Down
  1. 1. Plants use sunlight, water, and CO2 to make food (releases oxygen).
  2. 3. Control opening/closing of stomata in plants.
  3. 4. Cellular waste (animals) and plant food source.
  4. 5. Branching tubes connecting trachea to lungs (animals).
  5. 7. Air passage from nose/mouth to lungs (animals).
  6. 8. Breathing organs for aquatic animals (extract oxygen from water).
  7. 10. Animal organs for gas exchange (oxygen & CO2) between blood and air.
  8. 12. Tiny lung pockets for animal gas exchange.