This is a great point of comparison. I feel that societal systems (and associated complexities) are more rigid than biological systems in the sense that a biological systems evolve efficient solutions in response to changing internal and external stimuli while societal systems cannot/will not due to man-made laws, norms, expectations etc. The latter (biological systems) shows first order adaptation while the former (societal) shows, at best second and third order adaptations, if it even adapts.