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.
The President is responsible for implementing and enforcing the laws written by Congress and, to that end, appoints the heads of the federal agencies, including the Cabinet. The Vice President is also part of the Executive Branch, ready to assume the Presidency should the need arise. The Cabinet and independent federal agencies are responsible for the day-to-day enforcement and administration of federal laws.
In the United States, the president is the head of state and ultimately responsible for the things that happen while he is in office, but it is impossible for him to manage every area of government personally. To facilitate management, each department of government is represented by a cabinet member. Each department is then in a better position to advise the president on issues that have to do with specific areas of governance.