In at least 150 to 200 words, explain how language was transmitted and evolved?and fast

Languages from the past is really impossible to say how it was transmitted since we don't have time machines, all our "facts" about the past that no one really knows of are theories and i have one of my own. How language was transmitted back way back from anyone's' possible thoughts you might think of cave men with a lot of improper speech (Ex - "Me go find food.") but in my own theory i think that it wasn't really a lot of talking i feel as if it was just a lot of doing what the early humans thought first until we started to evolve more and more, so instead of doing without caution its mindless. When i think of  cave men (Early humanity) i think of a lot of family's and fighting between them because they don't know how to think properly or speak yet. Obviously sooner on we started to think and learn more and time went on and we made up our own languages across the globe instead of possible grunting and groaning and hand language. As time is today from all of what we have discovered the languages we know we can all learn and that's how we evolved within out languages because we learned more and more from the others around us.

I know i put it in my own theory and words but if you don't end up copying it i hope it gives you a general idea. Have a good day, and Good Luck!

i think it would be reparing roads