ensuring the continuation of a species is required for the survival of that species
preserving_own_species is biological_goal. survival is continuance. preserving_own_species is not biological_goal. color_of_fish is function_of_fish's_survival. endangered_species is species. mortal_species_survives_must has method_for_reproduction mortal_species_survives_must has not method_for_reproduction endangered_species is not species. tolerance is endurance. animal_species is species.