Question

the diffusion of water, a very small polar molecule, is such a vital process in living organisms that it has its own name: osmosis. even though water molecules are polar, they are very small, so they can pass through the phospholipid bilayer slowly. water molecules can travel more quickly across the cell membrane through integral proteins called aquaporins. this video shows osmosis. select the true statements. water molecules can cross the cell membrane by simple diffusion. water molecules can cross the cell membrane by facilitated diffusion. water molecules move down their concentration gradient. osmosis uses cellular energy.

Explanation:

Water can cross membranes slowly by simple diffusion due to its small size. Aquaporins allow for facilitated diffusion of water. Osmosis is passive and water moves from high - to low - concentration areas (down the gradient), and it does not use cellular energy.

Answer:

• Water molecules can cross the cell membrane by simple diffusion.
• Water molecules can cross the cell membrane by facilitated diffusion.
• Water molecules move down their concentration gradient.