The first stage of alzheimer disease is characterized by:

In the first stages of Alzheimer’s disease, the patient affected may experience symptoms, such as memory loss of certain events. As the time passes, the patient may experience long-term memory loses, the patient may also revert into being a child. Patients who has been diagnose with Alzheimer’s Disease are commonly diagnosis with pneumonia, which may lead to their death. 

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.