Trace elements are required by organisms in only minute quantities (less than 0.01% of mass).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 for essential biological processes such as oxygen transport, DNA synthesis, and energy production. While the other choices (B) calcium, (C) iodine, (D) sodium, and (E) potassium are also important for various physiological processes, they are not required by all organisms.

Trace Elements Are Required by Organisms in Only Minute Quantities