A SNP is a variation of a single nucleotide between individuals. These polymorphisms can therefore be used to discern small differences both within a population and among different populations.
President of the United States. The President of the United States is the head of state of the U.S., the chief executive of the federal government, and Commander-in-Chief of the armed forces. The United States was the first nation to create the office of President as the head of state in a modern republic.
List of Presidents of the United States 1. List of Presidents of the United States. The White House, the president's official residence and center of the administration. Under the U.S. Constitution, the President. of the United States is the head of state and. the head of government of the United States. As chief of the executive branch and head of. the federal government as a whole, the. presidency is the highest political office in. the United States by influence and. recognition.