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) calciumb) iodinec) sodiumd) phosphorus

B) iodine

Explanation:

Iodine is a trace element. It is an inorganic mineral. It is essential component in the human diet. It is useful for the production of the thyroid hormone. Iodine salt and seafood are the major sources of iodine.  It is also the major component of human blood that is the hemoglobin. In bacteria or plants the iodine is not required. Iodine is not an essential nutrient for plant growth. Iodine can kill the bacteria.

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