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A student wants to test how music affects plant growth. He grows some plants in a bedroom window with music playing twenty-four hours per day. He grows a

different variety of plants in his backyard with no music playing. What is the main problem with the design of this investigation?


I think the problem is that, he placed the plants in a bedroom. While the other is in his backyard. It would be fair if, he put all the plants in the backyard and just seperate the plants that he want to played by a music because the sunlight can affect the plants growth.
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