In physics, the increase of entropy expressed by the second law of thermodynamics shows a tendency toward a progressive “disorganization” of the system. On the other hand, biological or social evolution is accompanied by a progressive structuration such as that introduced by the division of labor in the history of human societies.
Even in the simplest cells the normal metabolic processes imply several thousand complex chemical reactions. Therefore, out of absolute necessity all these processes must be coordinated. These coordinating mechanisms constitute an extremely sophisticated functional order.
Life is a very ancient phenomenon and its origin must imply a very considerable sequence of successive instabilities.
Is there a limit to complexity?
The family (a relatively small unit) is a conformist element in a society containing small fluctuations. In contrast, society as a whole constitutes the greatest dimension of fluctuation, and in consequence is subject to the least constraint (except at certain times, such as during a war).
We find that division of labor and castes appears in insect societies as the result of evolution of large colonies existing in a rich medium. The competitive unit, subject to selection, in this case is not the individual, but the group.