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you want to study the effect of different types of water on the growth of plants you choose the same type of plants. all plants are planted in the same type soil, placed in the same location, exposed to the same room temperature. You water each plant with one of the four different types of water (salt water, regular water, sugar water and distilled water.) after a two-week period, the height of the plants is measured. what is the manipulated, responding, variable
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