with a "control group." The two groups are exactly the same except for the one variable being tested. For example, in your experiment on dissolved oxygen and trout, you may select to use two aquariums and 5 juvenile rainbow trout. The aquarium, food, light source, location of the aquarium, ambient temperature, water temperature, trout stock, trout gender, and age of trout all have to be exactly the same. However, the water in one aquarium has a dissolved oxygen level of 3 mg/l and the other has a "normal"
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