I believe it would be mesentery
Water diffusion is called osmosis. Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
C.Plant cells have a large central vacuole that takes up most of the cell's space, and animal cells have many smaller vacuoles.
Hope it helps : )
