"Because the patterns of development in all realms of nature are analogous, evolution appears to drive toward the superposition of system upon system in a continuous hierarchy, traversing the regions of the suborganic, organic, and supraorganic. Organization in nature comes to resemble a complex, multilevel pyramid, with many relatively simple systems at the bottom and a few (and ultimately one) complex system(s) at the top. Between these limits all natural system take intermediate positions; they link the levels below and above them. They are wholes in regard to their parts, and parts with respect to higher-level wholes."

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