The presence of which kind of molecule determines the concentrations of other substances in the body? water carbohydrate protein sugar

I believe the answer is water

Answer: Water

Explanation:

Water is a necessary molecule that is consider as a universal solvent as it dissolves within it almost all other molecules. It is necessary for maintaining the concentration of water soluble biomolecules, vitamins, minerals in the body which are important for cellular metabolism, growth and functioning of the body.