Members of the United States House of Representatives are elected to serve 2-year terms. Members of the U.S. Senate serve 6-year terms.
Every two years.
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a senator can serve for 6 years [a term] and a represtative for 2 years
The stand for election (or re-election) every two years.
The stand for election (or re-election) every two years.
population
the population
To be in the House of Representatives, you must be at least 25 years of age, have lived in the United States for at least 7 years, and be an inhabitant of the state in which you shall be chosen.
This is a bad question because it implies a change took place. In fact, the way House of Representatives legislatures were chosen has always been the same: "House of Representatives shall be composed of Members chosen every second Year by the People of the several States." Article I, Section II
By the states
by people voting for them
Population