A well-controlled experiment will

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    use only the purest of materials.
    have multiple variables that are investigated in every trial.
    be continuously observed and monitored to discover the results.
    have only one critical variable that is changed over several trials.
    maintain all variables of the experiment exactly the same in every trial.
asked May 30, 2013 in Biology by anonymous
    

1 Answer

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have only one critical variable that is changed over several trials.
answered May 31, 2013 by Bioshare ~Top Expert~ (34,070 points)

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