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.
Presidents may urge Congress to pass new laws or veto  bills that they do not favor.    Party leader    Roles: In this role, the president helps members of his political  party get elected or appointed to office. The president campaigns  for those members who have supported his policies. Chief of State-the ceremonial head of the government and the symbol of national unity. 2  Chief Executive-which is responsible to see that the laws of the federal government are enforced. 3  Chief Legislator-seeks to influence the lawmaking process, signs bills into law or vetoes them.