if an organ digests food then the food must pass through that organ
bird_digestive_tract is digestive_tract. turkey is food. bird_digestive_tract is not body_part. digestive_system has not do_with_food all_animals has digestive_system digestive_tract is organ_system. bird_digestive_tract is body_part. digestive_tract is not organ_system. digestive_system has do_with_food bird_digestive_tract is not digestive_tract.