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science

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the last question i do not get can one of y´all help me out lisa is working on a science project her task is to answer the question ¨does rogooti(which is a commerical hair product) affect the speed of hair growth
control group:
independent variable:
dependent variable:

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    control group: untreated hair
    independent variable: applicaton of rogooti or not
    dependent variable: hair growth over time.

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