Final answer:
Facilitated diffusion involves substances moving down their concentration gradient with the aid of transport proteins. Oxygen transport, however, does not use facilitated diffusion and instead moves through simple diffusion, making it the correct answer to the question.
Step-by-step explanation:
The facilitated diffusion process is a type of passive transport that allows certain molecules to move across the plasma membrane with the assistance of specific transport proteins. This movement does not require energy and occurs down a molecule's concentration gradient. In the case of facilitated diffusion, substances like glucose or ions utilize protein channels or carriers to enter or leave the cell. For example, glucose enters cells through glucose transporters, and ions might use channel proteins or carriers that act in a symport or antiport fashion.
Looking at the given options, each example listed involves facilitated diffusion except for the transport of oxygen, which does not require a specific membrane receptor or channel protein for its movement through the cell membrane. Instead, oxygen moves through simple diffusion due to its small size and ability to pass easily through the lipid bilayer.