breathing is when animals convert oxygen into carbon dioxide
periodic_breathing is breathing. air has oxygen_nitrogen_and_carbon_dioxide reptile is air_breathing_vertebrate. wheezing is breathing_event. human_lungs is most_efficient_mechanically_when_breathing_gas. mammal is air_breathing_vertebrate. dinosaur is air_breathing_vertebrate. hyperventilation is breathing. inhaled_air is oxygen. oxygen_mask is breathing_device.