All human societies have language.
It is very likely that capacity for language is based in our brains and our genes, and was selected for because it helped our ancestors survive and reproduce. After all to experience is to be conscious. Whatever it takes to make you, for a lifetime, produce and recognise all and only the grammatically correct sentences of any human language. First, it's a mystery how that can be done at all. Then, linguists gradually piece together what rules would be needed to produce and recognise all and only the grammatically correct sentences.