A constitutionally recognized officer of the Senate who presides over the chamber in the absence of the vice president. The president pro tempore (or, "president for a time") is elected by the Senate and is, by custom, the senator of the majority party with the longest record of continuous service.
<span>A) mood contagion. This is because of the moods of the other people around them and the way they present themselves. A mood is contagious. </span>
