How are simple diffusion and facilitated diffusion similar?

Simple diffusion, on the other hand, is the passage of a molecule or ion in a membrane without the or aid of another intermediary such as proteins. what drives the molecules and ions from a certain point to the other side of the membrane is through diffusion’s force. however, there are certain criteria before a molecule or ion can penetrate through the cell membrane. the molecule or ion must be able to pass through the hydrophobic wall of the membrane. a few types of molecules can pass with ease which are hydrophobic. these are oxygen, ethanol, and carbon dioxide. in simple diffusion there is no energy involved in the penetration of these molecules.facilitated diffusion is also called facilitated transport or passive mediated transport. it is a process in which the type of transport is passive that is enabled by proteins. diffusion by this type is also spontaneous, unstructured, or unplanned passage of molecules or ions in a membrane through the aid of proteins. certain molecules cannot pass through a membrane such as certain polar and non-polar molecules. small, non-polar molecules can diffuse easily. an example of this is oxygen. large molecules are diffused through the aid of proteins.