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.
As leader of the executive branch, the President is primarily responsible for seeing that the work of government is done. The responsibility to administer and execute the laws of the land squarely rests on the President's shoulders. The president must therefore recruit and appoint many people to top government jobs. Cabinet members, many sub-Cabinet positions, federal judges including Supreme Court Justices, ambassadors, top military leaders, and heads of independent government agencies are all appointments filled by the President.