Nice question. I imagine it was so they could do trade with one another, and share information about routes across the deserts/seas, and chat each other up in general.
It is possible to explain via evolution i you think about it the ability to use language to pass on complex ideas and information has a huge selective advantage – if you can teach your young to avoid something bad or do something good – then you’ll reproduce better than others and hence survive!
So it probably started off as different noises and grunts and as the information passed on become more complex so did the language……
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