breathing out is when animals expel carbon dioxide from their lungs into the air
mammal is air_breathing_vertebrate. artificial_respiration is not breathing. mammal is not air_breathing_vertebrate. artificial_respiration is breathing. bird is air_breathing_vertebrate. dinosaur is air_breathing_vertebrate. reptile is air_breathing_vertebrate. reptile is not air_breathing_vertebrate. dinosaur is not air_breathing_vertebrate. smoke is breathing.