Consider a beaker that is separated into two parts by a biol…

Consider a beaker that is separated into two parts by a biological membrane, and some type of molecule is dissolved in water on both sides. At the beginning of an experiment, the molecule is present in equal concentrations on both sides of the membrane (as shown in the figure on the left) and at the end of the experiment, the molecule is present at a higher concentration on one side than the other (as shown in the figure on the right). Which of these statements about this experiment MUST be true?