sentences: digestion is performed by the digestive system
docs: digestion is organic_process. digestive_system has liver_and_gallbladder digestive_tract is body_part. digestion is learning. digestive_system is system. digestive_system has do_with_food every_living_human_being has digestive_system digestive_tract is organ_system. digestion is chemical_process. gastric_digestion is digestion.