It is generally believed that modern languages developed after the end of the last ice age. Before that, communication was by means of proto-language. Proto-language (or pre-language) lacked a fully-developed syntax; tense, aspect, auxiliary verbs, etc.; and a closed (non-lexical) vocabulary. It was a stage in the evolution of language somewhere between great ape language and fully developed modern human language. No traces of any proto-language exist and they are unnamed.

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