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.
Responsibilities of the President of the United States. The President is the very important figure in the politics of the country. Known was the 'Head of the State or Government', the President has to shoulder many responsibilities, once he/she steps into the office. The President of the United States is the head of both the state and central government of the country.