500
Called "the spark plugs of life," these are four of the many minerals used by the human body. (name four, in question format)
What are calcium, magnesium, potassium, sodium, phosphorus, sulfur, iron, boron, chromium, manganese, iodine, selenium, molybdenum, silicon, vanadium, zinc, lithium, germanium, copper, cobalt, and rubidium.