Final answer:
Amoxicillin is more stable in stomach acid compared to ampicillin, which affects absorption and the incidence of diarrhea as a side effect.
Step-by-step explanation:
Amoxicillin is more stable in stomach acid compared to ampicillin. This property affects absorption and the incidence of diarrhea as a side effect. Amoxicillin's stability allows it to remain active in the acidic pH of the stomach, ensuring better absorption into the bloodstream. On the other hand, ampicillin is less stable and may degrade in the stomach, leading to lower absorption and potentially causing gastrointestinal side effects like diarrhea.