a spine is a part of a cactus that is hard and located on the outside of the cactus
spine is aculeus. spine is bone. cactus is succulent. spinal_nerve_root is spinal_nerve. sacral_spine is bone_structure. posture_chair is chair. spine is process. spinet is upright. spinal_nerve_roots is spinal_nerve. lumbar_spine is bone_structure.