Here's why:
* Passive transport means that energy is not required for the movement of molecules across the membrane. Instead, the movement is driven by the concentration gradient (molecules move from areas of high concentration to areas of low concentration).
* Facilitated diffusion is a specific type of passive transport that uses carrier proteins embedded within the cell membrane. These proteins bind to the molecules they transport, which allows them to move across the membrane even if they are too large or too polar to pass through the phospholipid bilayer on their own.
Let me know if you'd like more details on facilitated diffusion or other types of transport!
