sentences: fossils are formed by the remains of living things
docs: fossil is remains. fossil is natural_inanimate_thing. reptiles is living_dinosaurs. geological_formation is tangible_thing. archeological_remains is remains. archeological_remains is relic. belemnite is fossil. fossil is petrification_of_living_being. relict is geological_formation. dead_living_organism is natural_inanimate_thing.