A study investigating the effects of light exposure on the growth of algae exposed three groups of algae to different light intensities: low, medium, and high. Over four weeks, the growth of the algae was measured in terms of biomass. The medium-light group showed a 30% increase in biomass, the low-light group showed a 10% increase, and the high-light group showed a 12% increase. Which of the following conclusions is best supported by the results of the study?