Why are cells microscopic? The answer relates to the need for the cell to effectively bring materials in and remove waste. In this activity, create simulated cells (agar blocks) of different sizes and examine how effectively a substance is able to diffuse into the cell in a set period of time. A special indicator in the cells will allow for visualization of the degree of diffusion. The results will clearly display the fact that a smaller volume creates a more favorable condition for the exchange of material across a cell membrane. Kit contains enough materials for a student to perform the activity twice. Instruction Manual included.