Answer: I have a feeling that you'll see little or no difference in the growth of your plants. There may be some subtle differences, but because these three types of water are so similar, I'm afraid any differences you find will be the affects of other factors. I suggest you think of an experiment using other, more "drastic" variables. For example, you might water with a saltwater solution, to mimic how plants are affect by road salt spray, or use a vinegar solution, to mimic acid rain. I think you'll get more interesting results, and you'll be able to relate them to real-life situations.
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