Who is has top position in the senate?

Answer 1

Officially, the Vice President presides over the Senate but can only vote in case of a tie. Usually, the V.P is not there so the president pro tempore stands over the Senate (usually an senior member of the Senate). It is basically an honorary position, and even the pro tempore is replaced by junior members of the Senate to understand what is going on in the Senate. However, the majority leader (leader of the majority party in the Senate) wields the most power, similar to the power of the Speaker of the House