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An experiment was conducted to see if different colors of light help plants grow better. The experimenter placed four plants (all the same type) underneath different lights. One was placed under a white light, another under a red light, the next under a blue light, and the last one under a green light. Everyday, the experimenter watered them the plants the same amount at the same time. He/She also recorded how high each plant grew for two weeks and then analyzed the results.a) What is the independent variable?
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