“The physical structures of organisms play only a minor and secondary role… The only requirement which physical structure must fulfill is that it allow the characteristic behaviors themselves to be manifested. Indeed, if this were not so, it would be impossible to understand how a class of systems as utterly diverse in physical structure as that which comprises biological organisms could be recognised as a unity at all.”

—  Robert Rosen

Robert Rosen. "Anticipatory systems in retrospect and prospect," in: General Systems, Vol. 24 (1979), p. 12; AS cited in: Nadin, Mihai. " Anticipation and dynamics: Rosen's anticipation in the perspective of time http://www.nadin.ws/archives/966." International journal of general systems. 39.1 (2010): 3-33.

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American theoretical biologist 1934–1998

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