type of digestive system is a kind of characteristic
digestive_system has liver_and_gallbladder mammal_digestive_tract is digestive_tract. digestive_system has eleven_basic_components digestive_system is system. digestive_system has do_with_food every_living_human_being has digestive_system digestive is substance. digestion is anatomical_structure. digestive_tract is organ_system. all_animals has digestive_system