Understanding your blood oxygen levels when you are at rest is something that you need to do if you want to make the most of the oxygen that's entering your body. Normal blood oxygen levels for the average American is about 90 to 100 percent oxygen saturation.
Chief of State. Every nation has a chief of state, a person who serves as the symbolic leader of the country and represents the nation. In the United States, the president both leads the government and acts as the chief of state, although this is not the case in many countries.
Chief executive The president is the chief administrator, or chief bureaucrat, of the nation and is ultimately responsible for all the programs in the executive branch. Responsible for seeing that all laws are faithfully executed, a president sets the broad policy for the executive departments and agencies rather than managing their day-to-day operations.