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What would a control be for an experiment to see whether fertilizer helps a plant to grow?
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What would a control be for an experiment to see whether fertilizer helps a plant to grow?

User Psv
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The control would be how much fertilizer you put in. This would be the control because if you put more fertilizer in one plant than the other, the thing helping the plant grow may not be what type of fertilizer but how much fertilizer.
User Roy Milder
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