There are two different possible answers. Officially, the president pro tempore is to preside. However, that title is now used mainly as an honorific, given to the longest-serving Senator of the majority party. The president pro tempore has the power to appoint another Senator to act as presiding officer for a given day of Senate proceedings.
== == == == the presiding officer in the senate is the vice president president of the senate
Viice presiident
vice president
The US Senate.
The president of the state Senate is the presiding officer of a Senate. He is the successor of powers and responsibilities of the President.
The "president pro tempore" either presides or (more often in modern times) appoints another Senator to act as presiding officer.
== == == == the presiding officer in the senate is the vice president president of the senate
The president Pro-Tempore is the presiding officer in the senate. That individual is in charge of the Senate agenda in the absence of the vice president.
Viice presiident
Vice President
the Vice President
vice president
Vice President
vice president
The US Senate.
Vice President.
Joe Biden