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QUESTION
When more than one variable in an experiment is changed at a time, the scientist A. made a systematic error that needs to be corrected. B. cannot tell which change produced the results. C. cannot accu
When more than one variable in an experiment is changed at a time, the scientist A. made a systematic error that needs to be corrected. B. cannot tell which change produced the results. C. cannot accurately measure both variables at the same time. D. needs to conduct more trials in order to get conclusive results.
