if a living thing takes in something to perform a process then that something is required for that process
life is living_thing. aerobic_thing is living_thing. living is arduous_process. recovered_thing is living_thing. living_thing is tangible_thing. living_thing is living_or_fictional_thing. living_organism is living_thing. organism_part is living_thing. human_process is process. humans is living_things.