a lack of something that a living thing requires prevents the survival of that living thing
life is living_thing. biologically_viable_thing is living_thing. living_thing is tangible_thing. living_thing is living_or_fictional_thing. living_thing is finite_spatial_thing. congenital_thing is living_thing. survival is goal_of_many_things. immune_thing is living_thing. at_risk is living_thing. survival is life.