Respuesta :

Because water is a polar molecule, it makes an excellent solvent for polar and ionic compounds found within cells and tissues. 
SalenKotch

Liquid water, acting as a solvent in organisms, aids in all of the following EXCEPT constructing cell membranes. Cell membranes are composed of phospholipids. Because of this, they do not dissolve in water and form a natural barrier in a watery environment.