What is the primary purpose of the house and senate

SENATE:

The framers of the Constitution created the United States Senate to protect the rights of individual states and safeguard minority opinion in a system of government designed to give greater power to the national government.

HOUSE:

Notice that members of the House are elected every two years, whereas senators are elected for six-year terms. ... Senators are at least thirty years old and citizens for nine years. Another difference is who they represent. Senators represent their entire states, but members of the House represent individual districts.

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a. competition with other nations.