A group of students wanted to learn how the concentration of copper in water affects the survival of tiny aquatic plankton called Daphnia. The students made four different copper solutions: 0% copper, 0.5% copper, 1% copper, and 2% copper. They poured 200mL of each solution into separate beakers and added 10 Daphnia
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A group of students wanted to learn how the concentration of copper in water affects the survival of tiny aquatic plankton called Daphnia. The students made four different copper solutions: 0% copper, 0.5% copper, 1% copper, and 2% copper. They poured 200mL of each solution into separate beakers and added 10 Daphnia to each beaker. After 5 days, the students counted how many Daphnia were still alive in each beaker. What is the control treatment in this study?
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