Water soluble molecules often enter or exit a cell in what process?
a.
facilitated diffusion
b.
simple diffusion
c.
active transport

Water soluble molecules often enter or exit a cell in a simple diffusion. (B)

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).