And of course it has never been said that the discerning of an Invisible Hand at work in the affairs of men precludes any planning or cooperation on thier part. Rather, the division of labor, and the distribution of goods and services require a great deal of planning on the part of the individuals who are engaged in the various component activities that make up the whole.
You miss Adam Smith's point. Individual's plan for their on benefit, but contribute to something greater. the economy as a whole is unplanned.
In the case of livng things, each individual works for its own survival, and in doing so contributes to the design of populations. It is the population that evolves, not the individual.
You might check this out:
http://www.dailyspeculations.com/derosa/derosareview051303.html