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I test three food items (yogurt, a potato chip, and Coca Cola) in the lab...

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Biology

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I test three food items (yogurt, a potato chip, and Coca Cola) in the lab for the presence of the macromolecules of life (proteins, carbohydrates (starch or sugars), and fats. Yogurt had sugars, fats, and proteins. The potato chip had fat and starch. The Coca Cola contained only sugars.What would you use as a negative control for the fat test?Water on a paper towelOil on a paper towelOil plus water in a test tubeWater plus sugar in a test tube

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