Who is the presiding officer of the Senate whenever the vice president is not present? president pro tempore ambassador to the U. N. the president speaker of the House

The president pro tempore.

The Constitution provides for a president pro tempore to preside over the Senate in the absence of the vice president.Exclusive of 1886-1947,the president pro tempore has been included in the presidential line of succession

Explanation:

could you show the options for the answers? : )

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