What is the main function of the central vacuole in a cell?
a. breaks down molecules to release energy
b. absorbs energy from the sun to produce food
c. contains the cell's genetic material
d. holds water and maintains turgor pressure

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Which of the following represents the results of a review of well-controlled studies of vitamin c supplementation on the resistance to, and recovery from, colds? there was a reduction in the duration of colds by 50% on the average. there was a slight effect on reducing the duration and severity of colds for people taking vitamin c supplements. there was a significant reduction in the duration of colds in people who consumed at least one gram a day. there was a significant reduction in the number of colds only in people who consumed > three grams per day.

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