The people who vote in a open election.
The House of representatives.
The president appoints the supreme court justices
The executive appoints such, as they report to him. In the United States, this is the President.
The President appoints ambassadors.
President of India appoints the Governor of states in India
If the president of the United States dies in office, a judge will normally swear her or him in. This has happened on several occasions.
The President of the United States.
The President of the United States appoints Cabinet members to assist in the carrying out of the Presidential power of day to day operations in the White House. Members of the Cabinet in managerial positions have to be approved by Congress.
The President of the United States has advisers that make up the Cabinet. Each President of the United States appoints several people, usually called Secretaries, to head the different departments within the Federal government.
If the President dies, the Vice-President takes the Presidential Oath of Office and becomes President of the United States. She then appoints a new Vice-President, with the advice and consent of the Senate.
If there is no majority in the Electoral College, the members of the US House of Representatives elect the President. No one ever appoints a President of the United States.
If the president can no longer serve term, and neither the vice president, then the Secretary of State gets in charge. ...Or at least I'm pretty sure.
The President of the United States appoints district court judges, but they must be approved by the US Senate. The president also appoints the justices of the Supreme Court and the appeals court judges.