I think they didn't, they communicated themselves by signals.
The Indo-European parent language was first spoken by a prehistoric people in the Eurasian steppes around 4500-2500 BCE. This language eventually evolved and diversified into many different branches, giving rise to the Indo-European language family spoken by billions of people today.
tavo
the development of a "common language" allowed for more accurate comunication and also helped push along increased intelligence
True, it is!
No written language.
No written language
There is none that I can find! LOL! Sorry...
Was technology important to prehistoric people
In prehistoric times, before there was written language to make a record of it. Possibly before there was much in the way of spoken language, either. Think in terms of cave men.
Those are prehistoric people; I don't think much is known about any language they may have had. From Wikipedia: "Neanderthals made advanced tools, probably had a language (the nature of which is debated and likely unknowable) and lived in complex social groups..."
It was before there was language and writing (prehistoric) so there is no way to answer. Sorry-
they sucked