Do the same experiment in using a beaker 9 a 3 series. Series 1 drip coffee into the water, where the cultivation of aromatic roots. 2 drops. Series 2 drip coffee into the water, where the cultivation of aromatic roots. 10 drops. Series 3 do not drip coffee in crop roots burner. By the water control. The size of the onion the size of beaker, equally placed three sets of experiments in the laboratory and to get equal amount of light.
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