If one part of the organism is changed then it will affect the other parts. These are the similarities between an organic organism and a social organism, however these are not the same and the organic body should only be used as a purpose of illustration. The comparison with an organic being only highlights the co-operation among the component parts for the benefit of the whole. There are great varieties in the degrees of growth. Those that are the most complex are at a higher stage of evolution.
Larger societies result from the aggregation and re-aggregation of smaller societies.
This process above is what has formed the modern nations. The increase in size also leads to an increase in the structure. As societies grow they become more complex. The more complex they are the more the parts are mutually dependent. Society begins with two divisions in its organization.