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matthew set up an experiment to see if a fertilizer affects the growth of bean plants. matthew watered each of the 10 bean plants in group a with 50 milliliters of a
solution of distilled water and fertilizer. he watered each of the 10 bean plants in group b with 50 milliliters of distilled water only. he watered both groups of plants
every other day for 1 month and grown under the same conditions.
the control for matthew's experiment was
group a, only
group b, only
both group a and group b
neither group a nor group b
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