Question

question 19
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 humans and other vertebrates?
○ nitrogen
○ calcium
○ iodine
○ potassium
○ phosphorus

Explanation:

Nitrogen, calcium, potassium, and phosphorus are major elements in the human - body and other vertebrates, required in relatively large amounts. Iodine is a trace element essential for the synthesis of thyroid hormones in humans and other vertebrates.

Answer:

C. iodine