Chapter 6, Problem 1RA

The movement of water across a plasma membrane occurs by

$\begin{array}{l}\text{a}\text{. an active transport water pump}\text{.}\hfill \\ \text{b}\text{. a facilitated diffusion carrier}\text{.}\hfill \\ \text{c}\text{. simple diffusion through membrane channels}\text{.}\hfill \\ \text{d}\text{. all of these}\text{.}\hfill \end{array}$