Final answer:
The microorganisms in the gastrointestinal (GI) tract benefit our health by aiding digestion, nutrient absorption, and providing protection against pathogens.
Step-by-step explanation:
The microorganisms in the gastrointestinal (GI) tract benefit our health by aiding digestion and nutrient absorption. They contribute to the production of feces and flatus, break down food, and help produce valuable nutrients like vitamins. These microbes also have immunomodulatory roles and protect us from pathogenic microbes.