Without communication, culture would be dead and would not exist as it does and as you know it.
It is because of the communication of ideas that they become real and sensible to others and it is by communication that others know about them and by their agreement they become customs, and beliefs, and stories come forth, and legends come to view, and history happens and is told, and religion becomes alive and thoughts about the universe happens and how this and that came about and so forth.
The are dynamic systems which interact with one another, and if there was only one culture; one general culture which existed on this earth, there would still exist this dynamic quality about it because I don't think, theoretically and practically, that there has to be so many cultures for cultures to survive at all.
If you look at it from a purely biological point of view, you would see that cultures which survive the most are those which are the most in communication with one another; and those who have within their system an influence which antagonistic or against the direction in which the culture is moving, there is a discord and to that degree, that culture does not survive as well as it could. And all of this because of the lack of communication at the point in the system, for whatever reason there is that lack there, there is still a lack of communication there.
There would be no cultures if there was no agreement about the beliefs about them and there would be no culture if there was not communication about these realities to one every member of the culture.
Cultures exist because they are communicated among the people where they come from and it express the active life of that people and peoples. For many, culture is the driving force behind their life and it is a source of thrust for them to be from and part of a definite culture.
It is so amazing to see the variation of cultures that exist at different settings of the world and the topic at once extends beyond the antropological study of it, to a philosophical study and is there where questions and answers are found concerning it.
This world would be so bland without culture and there would be no life moving these cultures if it were not for communication between and amongst the entities which constitute these cultures, whether legal, political, ethnic or otherwise.