bacteria can help digest food in humans
bacteria is microorganism. digestive_system has mouth_and_salivary_glands digesting is involuntary_bodily_function. bacteria is bacteria. legionella is bacteria. yogurt has bacteria_in every_living_human_being has not digestive_system every_living_human_being has digestive_system digestive_system has do_with_food digesting is not involuntary_bodily_function.