http://en.wikipedia.org/wiki/Chin
The chin developed as a point of muscular attachment facilitating minute movements of the lips associated with speech.In human evolution, the chin is a cladistic apomorphy, partially defining anatomically modern humans as distinct from archaic forms. Non-human anthropoid apes have a simian shelf for example. Elephants are the only other animals considered to display such a feature,although this leads to debate over the use of the term.
The chin developed as a point of muscular attachment facilitating minute movements of the lips associated with speech.In human evolution, the chin is a cladistic apomorphy, partially defining anatomically modern humans as distinct from archaic forms. Non-human anthropoid apes have a simian shelf for example. Elephants are the only other animals considered to display such a feature,although this leads to debate over the use of the term.
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