The challenge is to express in dance what you can express in language. I express frustration if I shout. When I shout, I feel I have expressed what I feel. And you have felt it too, so you understand. But language is something different.
Definitions are rules for the translation of one language into another.
It is this which all have in common. If we don' know what a lnaguge is and isn't, then we don't of WHAT we are ask about the origins, or of WHAT we are asking about the adaptive value. But this is a rather abstruse point, so let us pass on. Just a short note. Of course among people the differences can outweight the commonalities, but that is a matter of value, not meaning.