protecting a inanimate place has a uncertain dirt on that inanimate place 's biomass / sickness
sterile_environment is tangible_thing. natural_inanimate_thing is inanimate_object. body_waste is natural_inanimate_thing. dead_tree is natural_inanimate_thing. sawdust is natural_inanimate_thing. inanimateness is physiological_property. insentience is inanimateness. ocean_zone is natural_inanimate_thing. ground is natural_inanimate_thing. lurking_place is hiding_place.