Which of the following trace elements needed by humans is commonly added to table salt?

Question

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Iodine is commonly added to table salt to prevent iodine deficiency, a condition that can lead to goiter and other health problems. Magnesium and iron are important trace elements for human health, but are not typically added to table salt. Fluoride is sometimes added to drinking water to promote dental health but is not commonly added to table salt.

Which of the Following Trace Elements Needed by Humans Is