Is There a Shared Linguistic Ancestors?

When did language first arise? If people only started talking to one another once the human population was decentralized and spread out, then it's extremely unlikely that everything can be traced back to one mother tongue. Maybe some early homosapian populations wordlessly separated from one another and each created its own language but all but one of those populations died or was permanently isolated. Or maybe one band people came back and colonized all the rest, and that language won out over the others. What we're really asking is how easily language is created and how easily it endures. All humans everywhere in the world are the same species, and that means we're all related. Most everyone we talked about in