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