what are vitamins . ( vza-usfg-kfx )
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A vitamin is an organic molecule that is an essential micronutrient which an organism needs in small quantities for the proper functioning of its metabolism. Essential nutrients cannot be synthesized in the organism, either at all or not in sufficient quantities, and therefore must be obtained through the diet.
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An economic activity is a process that, based on inputs, leads to the manufacture of a good or the provision of a service. ... may carry out one or more economic activities, but each unit has only one main activity.
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