Question

Having only one-third of its members stand for election at a time means that the Senate is

Answer 1

It makes the Senate a continuous body. Unlike the House of Representatives the Senate
always has membership in office, every 2 years ALL of the House--435 members must
stand for election. In the Senate only 1/3rd or 33/34 members stand for election.
So every 2 years the House must reorganize on opening day while the Senate need
not organize except if they have a change in the majority party, and for the assignment
of Committee seats for new members