We have multiple ideas, but no concrete proof since the development of language occurred in pre-history as far as we know so we can only speculate,
Language came about with a mix of grunting/pointing evolving over time
AND the adaptability and spread of humans over multiple environments
if humans had stayed in Ethiopia/Eastern Africa, the need for language maybe wouldn’t have been realised so early as there would be a limited amount of flora/fauna/weather/tactics that would need to be explained, grunts and pointing could be enough
but once humans stated getting to Egypt/Europe/Asia/Russia then the wide variety of flora/fauna/weather needed many more grunts compared to staying in Ethiopia, (basically there were too few basic grunts, so *advanced* grunts were needed) – this is one of the many theories of language development
This human spread, coupled with various ‘tools’, advancement of proto-religions (as far as we can tell) and communities and bumping into new tribes, meant language would *need* to follow because of the sheer complexity of things that would exhaust all the basic grunting combinations, now *advanced* grunting (the beginnings of language) would be needed, and over time the advanced grunting becomes geographically specific language(s)
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