Congress is divided/ into two parts/—the Senate/ and the House of Representatives./ Because it has/ two “chambers,/” the U.S. Congress is known/ as a “bicameral” legislature./ The system/ of checks and balances works/ in Congress. / Specific powers are assigned/ to each of these chambers./ For example,/ only the Senate has/ the power/ to reject/ a treaty signed by the president/ or a person/ the president chooses/ to serve on the Supreme Court./ Only the House of Representatives has/ the power/ to introduce/ a bill that/ requires Americans/ to pay taxes./