Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by all organisms?

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Iron is a trace element that is required by all organisms. It is essential for proper oxygen transport and various metabolic functions. Calcium is a macronutrient required in larger quantities, while iodine is only required by certain organisms (such as those producing thyroid hormones). Sodium and potassium are also macronutrients required in larger quantities.

Trace Elements Are Those Required by an Organism in Only