Valeria - My apologies as I may have failed to hit the "post" button for my comment on your essay and will respond here. What I had observed is that I like the analogy of the form of the human body being reflected in the form of greater humanity. Just as the cells of the body cooperate in creating and supporting the whole of a human being, all human beings participate in the creation and support for human civilization. One can also take the analogy the other way: the discrete chemical processes in each cell all participate in creating and supporting the whole of the human cell; the discrete physical particles within each chemical reaction participating in creating and supporting the whole of the reaction; the discrete quantum components participating in the creation of the whole particle.
I also agree that increasing diversity is essential to the evolutionary process at all levels. Diversity represents innovation - innovation is necessary to the exploration of potential pathways through the fitness landscape and the more diversity the more growth and progress we will experience.
Regards - George