Which element is in the greatest concentration in salts in the human body?

Sodium in the Body

Sodium is an essential nutrient but is something that the body cannot produce itself. It plays a vital role in the regulation of many bodily functions and is contained in body fluids that transport oxygen and nutrients. It is also essential in maintaining the body’s overall fluid balance.
To survive everyone needs to consume Sodium regularly. It is a principal component of a person’s internal environment – the extracelluar fluid. Nutrients reach your body’s cells through these fluids. Sodium facilitates many bodily functions including fluid volume and acid-base balance.
An adult human body contains about 250g of salt and any excess is naturally excreted by the body.

Ithink the answer is nuclear membrane

C. gemstones they are the only non metallic mineral from the list.