Describe one aspect of the digestive system that can decline with age and how that will affect the health of an elderly person

1. Describe one aspect of the digestive system that can decline with age and how that will affect the health of an elderly person.2. Briefly describe what biological factors are implicated in Alzheimer’s Disease and how they are thought to contribute to the disease?3. Explain why cancer is such a challenging disease to treat. 4. Aging is often a domino effect: one thing breaks down, which leads to breakdown of another, which leads to breakdown of another, and eventually creates an inevitable feed-forward loop of catastrophe. Using at least two physiological systems we learned, describe a domino effect that would result in aging.