the respiratory digest acting in space from the land
respiratory_gas_exchange is air_respiration. respiratory_tract is internal_body_part. air_bladder is sac. respiration is involuntary_bodily_function. air_respiration is respiration. respiratory_tract is solid_object. air_respiration is physiological_function. respiratory_tract is body_part. digesting is involuntary_bodily_function. air_path_through_solid is cavity.