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историја
1) One kind of threat to internal validity is called history. History refers to conditions that are changed at the same time as the manipulation of the independent variable. See also internal validity. 2) Conditions that an organism has been exposed to and its performances under them; often an abbreviation for experimental history, simply because experimental organisms are rarely observed continuously throughout their lives. History is particularly important when some conditions have irreversible or only slowly reversible effects.
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