The definition for Congress??

A national legislative body, especially that of the US. The US Congress, which meets at the Capitol in Washington, D.C., was established by the Constitution of 1787 and is composed of the Senate and the House of Representatives.

Explanation:

1: the act or action of coming together

2: a formal meeting of delegates for discussion and usually action on some question

3:a single meeting or session of a group

this null effect is caused by a weak manipulation and ineffective internal validity. in a scientific study, as the one dr. morimoto is trying to perfom, internal validity refers to the confidence placed in the cause-effect relationship and to how well an experiment is done and able to eliminate confounding variables.        

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