Minerals are needed for a. water balance and structural systems b. metabolic processes c. functioning of the nervous system d. All of these choices are correct

Option D) . All of these choices are correct

Explanation:

Minerals are inorganic molecules that could be vital to certain life processes. They include the following:

- Calcium, sodium, potassium

All of these plays important role in the opening and closing of ion channels in biological membranes and neurons

- Magnesium, manganese

Which serve as cofactors to many enzymes of metabolic pathways such as glycolysis, electron transport system.

- Calcium, phosphorus

Both serves as important constituent of teeth and bones, which are connective tissues and structure found in the body.

Thus, all of the choices are correct

one centimetre is equal to 0.01 metres