1. There are some people who get stressed as soon as there is a slight change in their day to day routine.
2. We all need a certain level of stress in order to function normally.
3. correct
4. … they needed an adrenaline trigger to alert us of danger so that we could escape and get out of harm’s way.
5. … although it won’t directly cause death, it can be a major factor in developing heart problems as we get older.
6. correct
7. Doctors haven’t been able to agree on exactly why this is, …
8. correct