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Why do scientists only test one independent variable in an experiment?
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Why do scientists only test one independent variable in an experiment?

User Radubogdan
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Testing only one variable at a time helps you look at the results of your experiment and to see how much a single change affected the result.

User Krontogiannis
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To not getting confusing results. By isolating one variable scientists can conclude the results of the experiment were directly impacted by the variable they changed and nothing else.
User Dannybrown
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