In the literal sense, there has been no relevant evolution since the trek from Africa. But there has been substantial progress towards higher standards of rights, justice and freedom - along with all too many illustrations of how remote is the goal of a decent society.
You can imagine a different world in which a number of species developed with different genetically determined linguistic systems. It hasn't happened in evolution. What has happened is that one species has developed, and the genetic structure of this species happens to involve a variety of intricate abstract principles of linguistic organization that, therefore, necessarily constrain every language, and, in fact, create the basis for learning language as a way of organizing experience rather than constituting something learned from experience.
There is no evolutionary pressure to create minds capable of forming sciences; it just happened. Evolutionary pressure has not led to higher rates of reproduction for people capable of solving scientific problems or creating new scientific ideas. So if, in fact, the science-forming capacities evolved for other reasons, it would not be too surprising if those particular structures that have developed proved to be rather special in their nature, reflecting the contingencies of their evolution or the working of physical law.
While language can surely be used for communication (as can much else), communication probably has no special role in its design or evolution.
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