Final answer:
Vitamins are organic substances needed in small amounts to promote and regulate chemical reactions in body cells.
Step-by-step explanation:
Vitamins are organic (carbon-containing) substances needed in small amounts to help promote and regulate chemical reactions and processes in body cells. Four vitamins are water soluble. They play crucial roles in maintaining good health and preventing diseases. For example, vitamin C is water soluble and is important for immune function and collagen synthesis.
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