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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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