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Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. The data from his experiment are shown in the table below. Amount of light (hours) Number of plants Average volume of oxygen produced (mL) 1 4 0.50 6 4 2.0 10 4 5.0 What could he have done to increase the validity of his data? Reduce the number of plants. Remove the 1 hour group. Add a 0 hours control. Measure the oxygen in liters.

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