Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: Materials must pass through a cell's semi-permeable membrane in order for energy to be utilized. This process is called
diffusion.
osmosis, diffusion. (Note: Both processes occur at semi-permeable membranes, but osmosis is a specific type of