The cuboidal cell of cell A's surface-area to volume ratio, which eliminates waste via diffusion most effectively, is 24: 8.
Volume grows more quickly than surface area as cell size increases because volume is in the form of a cube while surface area is present as a square. If the surface area is less and the volume is large then diffusion rate via the cell is slow and inefficient. Therefore, we can draw the conclusion that diffusion is more effective when there is a bigger surface area than volume.
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