General Assumptions

We reason that as cavities shrink transport grows more efficient because distances shorten. There are advantages to shrinking one's hemocoel. Fluids are heavy, and a shrinking animal loses weight, but diffusion through watery films insures transit. Confined to a plane surface and given infinite time, a randomly moving particle covers the entire area, so the probability of its transmission is now one, and delivery is assured provided we wait. Movements may also agitate the hemolymph, but the countering forces of cohesion and adhesion can offset effects of jostling, but in some areas superdiffusion may operate. The hemocoel, within limits, adapts to changes of volume, and in small bodies, supporting struts of a reduced skeleton may in turn be less massive, because fluid films behaving as minimal surfaces reduce total surface tension traction on skeletal supports (Ref: Lungs and Struts).

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