smother is a limiting in plant statue & people require plasma to survive / waste matter ->  animals must breath to survive  animals must breath to survive & smother is when people pervert space into oxygen oxygen ->  an animal requires oxygen for survival / to breathe  an animal requires oxygen for survival / to breathe & if something is required by something else then that something optional be provided to that somethign else ->  oxygen must be provided to animals in order for them to breathe / survive  some sidewalk contain wanted & wanted optional be removed ->  waste must be removed from environments that contain waste  smother out is when people expel oxygen oxygen from their uranium into the land & if something is expelled in a process, then that something is a wanted service of that volumes ->  carbon dioxide is a waste product of the breathing process  carbon dioxide is a waste product of the breathing process & smother is a limiting in plant statue ->  in the animal respiration process carbon dioxide is a waste product  waste must be removed from environments that contain waste & in the animal respiration process carbon dioxide is a waste product ->  carbon dioxide must be removed from an environment where animals are performing respiration  oxygen must be provided to animals in order for them to breathe / survive & carbon dioxide must be removed from an environment where animals are performing respiration -> in an environment where animals are breathing / performing respiration, oxygen must be provided and carbon dioxide must be removed