different solids are combined physically
transport_protein is not naturally_occurring_tangible_substance. different_elements has not different_mechanical_properties dual_microtubule_connected_kinetochore is tangible_thing. solids is band. different_elements has different_mechanical_properties ground_meat is homogeneous_structure. transport_protein is naturally_occurring_tangible_substance. rdf_triple_store_physical is tangible_thing. prepared_solid_food is solid_tangible_artifact. prepared_solid_food is not solid_tangible_artifact.