What is the best way to explain the role of the ego?

the ego controls full consciousness.
the ego will keep you on a morally correct path.
the ego is a mediator between the superego and id.

What is the answer to this particular question i have in health

In which way does nicotine cause addiction? by stimulating the brain’s pleasure center by increasing blood-sugar levels by decreasing dopamine levels by reducing depression and anxiety

Match the limiting factor with the correct definition. 1. learning about the benefits of exercise location/access 2. problem that can be solved by choosing free activities understanding 3. living close to a park motivation 4. how you were raised money 5. how you feel about yourself and your ability to exercise family behaviors