Science task 88: An ACT senior class applies the information to a public-policy, planning or research investigation. In experiment 28, pH is varied while growth of pea seedlings is measured. Why include an untreated control?

Science task 88: An ACT senior class applies the information to a public-policy, planning or research investigation. In experiment 28, pH is varied while growth of pea seedlings is measured. Why include an untreated control?

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