While walking in the forrest

This morning while walking down the forrest to come to work, some ideas finally set up its place in my brain,
I was thinking about several conversations with my best friend which refered to social structure,
I was a naive firm believer that a person can achieve a place in society trought their own effort and inteligence, instead of their social status or class, there was a time when I could not see such a concept as an active concept in todays society where the middle class is so extended, however my friend always argued with me about this and insisted that in human societa the existance of such a concept is a pilar for its organization and healthy development, that is is something we would never get rid off,
But is this true? can we get rid of concepts in society like class, or even more would it be possible one day to get rid of the concept of country, is it really healthy for society to perpetuate those concepts, or is it only useful to perpetuate differences?
It seems to me that since very early and in all types of human cultures differences have always existed for what we know the most ancient cultures were based in feudalism or explotation of the lower masses to the porpuse of support the reigning class at every particular culture,
those kind of differences are there even in the religous contest, which I dont even want to comment on, but it seems to me that the human society needs stratification in order to achieve certain development in other goods not only material but philosophycal as well,
of course that being a biologist I wonder about people with limitations to understand such a system, the outsiders sort of speaking, could it be that all these need for herarchyes is something that is either inhereted or is it learned after words or is it a complex kind of process that combines both possibilities?
are those individuals (maybe even several philosophers)- just a residual part of other posibility in human populations? have we been self selecting individuals who posses the hability to fit this kind of classist systems since the dawn of times and we could be missing the chance to live free of such a concepts?
I for once dont think that this kind of human structure is only inherent to human populations, since many other groups in nature are structure as well, in that case is not possible to say that is a kind of property learned after birth but is inherent to the animal populations through complex biochemical processes,
so maybe this structuration and class system is inherent to the animal kingdom, however I again wonder why is then, if we are suppose to have evolved beyonce most of the groups in the animal kingdom, that we keep selecting the same characteristics? will we ever learn to live without them? and if so, what implications in the biological and social point of view would it bring to us?
but as I said this is what I was thinking about when I was walking in the forrest.....