Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants?

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Quizplus · Accepted Answer

Iodine is a trace element that is required by humans and other vertebrates for the synthesis of thyroid hormones. However, bacteria and plants do not require iodine for any metabolic processes. Nitrogen, calcium, sodium, and phosphorus are all required by bacteria, plants, and vertebrates in varying amounts.

Trace Elements Are Those Required by an Organism in Only