Divine peace be upon truth seekers. Today I found an agnostic listening to the Recited Logos of Quran for the first time and he chose Chapter 55 and its very 4th verse talks about learning and teaching of language, but as the word recitation tells us, oral expressions also fall in the category of bayan or self-expression. The title of this article is exactly the question that came up in my mind after I read verse 4. Thanks for writing. I was happy to read about Neanderthal funerals because our Scripture also talks about corvid mourning.
https://thehumanevolutionblog.com/2015/02/09/did-neanderthals-speak
A spiritual Ishmaelite 