Definition.com
The Evolution of language (n.) out of simpler signalling is a puzzle as misframed as asking how atoms evolved from clouds of particles.
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Definition.com
The Evolution of language (n.) from animal calls is about as sensible a story as walking evolving out of breathing: the two stages share a name, not a mechanism.
Definition.com
The Evolution of language (n.) may be a non-question: if creatures built like us had no real alternative to our grammar, there was nothing to choose between.