Diffusion is slow over distances of a few millimeters, making it an unsuitable mechanism by which large animals exchange gases and nutrients between the external and internal environments.

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Diffusion is a slow process over distances greater than a few micrometers, making it inefficient for gas and nutrient exchange in large animals, which require faster mechanisms like circulatory systems to transport substances efficiently over longer distances.

Diffusion Is Slow Over Distances of a Few Millimeters, Making