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What is the independent and controlled variable in this test?????

April 26, 2017controlled independent Mathematics Test

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What is the independent and controlled variable in this test?????

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The independent variable is the pH of the shampoo, and the controlled variables are the amount of shampoo, the temperature of the shampoo, the sterility of the pH paper, the time the pH paper was left in the shampoo… I can’t think of anything else.