if a living thing requires something then an increase in that something has a positive impact on that living thing's survival
immune_thing is living_thing. life is not living_thing. living_thing is not tangible_thing. humans is living_things. life is living_thing. aerobic_thing is living_thing. recovered_thing is not living_thing. living_thing is tangible_thing. recovered_thing is living_thing. aerobic_thing is not living_thing.