Do you people have any tips to stop my stomach from hurting? And like not things that would stop me from doing school?

What causes fermentation a. antibodies b. antigens c. microorganisms d. antibiotics

If you know answer will mark brainliest

Andra has a family history of osteoporosis. her doctor advises her to eat foods rich in calcium. which foods should she add to her diet? a. fruits, especially grapes and berries b. unsaturated fats like olive and soybean oil c. beet greens, broccoli, and cheese