The liver is one of the important, major, and the largest inner organ. The liver regulates most chemical levels in the blood and excretes a product called bile. The storage of calcium is not a function of the liver. Calcium is stored in the bone.
Other options are correct; this includes the storage of iron, copper, and others. The major functions of the liver include Enzyme activation, metabolism of fats, proteins and carbohydrates, bile production and excretion, excretion of bilirubin, cholesterol, hormones, and drugs, storage of glycogen, vitamins and minerals, synthesis of plasma proteins such as albumin, and clotting factors, bold detoxification and purification. The liver is separated into a left and right lobe, which is separated by the falciform ligament.