With increasing organism size, diffusion distances grow, surface area expands, and volume increases more rapidly, leading to a decreasing surface area to volume ratio, which slows diffusion and enlarges diffusion pathways.
As organisms increase in size, diffusion distances increase, surface area increases, and volume increases faster than surface area, causing a decrease in the SA:Vol ratio, resulting in slower diffusion and larger diffusion distances.
| Front | Describe how diffusion distance, SA, volume and SA:Vol ratio vary with increasing organism size. |
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| Back | As organisms get larger:
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