a spine is a part of a cactus that is hard and located on the outside of the cactus
sacral_spine is bone_structure. lumbar_spine is bone_structure. spinet is upright. spine is aculeus. spine is bone. spinal_nerve_root is spinal_nerve. lumbar_spine is not bone_structure. spinal_nerve_roots is not spinal_nerve. spine is process. spinal_nerve_roots is spinal_nerve.