An experiment was designed to determine whether or not ultraviolet light affected the growth of lichens. Two groups of lichens were grown under identical conditions, in visible light, except one group of lichens was also exposed to UV light while the other was not. In this experiment the group of lichens grown in visible light without UV light is known as the A. control. B. hypothesis. C. dependent variable. D. limiting factor.

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the answer is choice c.

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