Keep in mind however, we should never consider insects, spiders and other invertebrates to be 'just' shrunken vertebrates. We often base our human assumptions about how 'animals work' on what we know of human biology. For example, a 'law' based on mammalian pulmonary and cardiovascular systems derives a three-quarter power allometric scaling relationship for metabolic rates of organisms describing distribution of gases and foodstuffs through linear space-filling fractal networks of branching tubes suggesting that tubular distribution systems characterize all organisms (Ref: Allometric Scaling). Because invertebrates often are so very small, they cannot employ closed systems of pumps and tubes in a vertebrate configuration.

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