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A(n) ______ is a carefully regulated procedure in which one or more variables believed to influence the behavior being studied are manipulated while all other variables are held constant.

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Answer: Experiment

Explanation: Experiment is the procedure or mechanism that is done to test the hypothesis or facts, discover result, determine the unknown values etc.It consist of the values, constants , elements ,components etc which are used for the measurements and calculations.

If the values or information gets altered/manipulated then it is supposed that the changes in the experiment results will not be accurate or correct. This procedure is carried out securely so that outcome is correct .