A student wants to shorten the ripening time for tomato plants. He predicts that the more water the plants receive, the faster they will ripen. To test this prediction, he grows 20 tomato plants in a garden in full sunlight that has dry soil and 20 tomato plants in a garden with a shadier location where there is greater moisture content in the soil. He then records the time it takes for fruit to develop and ripen on the plants in each garden location. State a serious error the student made with the design of the experiment. State all the constants in the problem.
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