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?
A) calcium
B) iodine
C) sodium
D) phosphorus

Question

Quizplus · Accepted Answer

Iodine is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants. It is necessary for the synthesis of thyroid hormones, which regulate the metabolism and growth of the body. Calcium and sodium are essential for all organisms, while phosphorus is required by all living cells for energy transfer and nucleic acid synthesis.

Trace Elements Are Those Required by an Organism in Only