Although you are writing a philosophy paper, I think you should include some biology into your study. After all, everything we are has roots in our biology and there are many interesting theories out there on where language comes from and how it's evolved. Furthermore, back in the olden days there was no distinction between biological studies and philosophy anyways.
Not knowing exactly what you're after, I'll just leave it at that for now, but just ask and I'll help you out if I can.
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