> So why didn't chimps get some of them? The chimps that did get them we now call humans. There were no chimps back then. We had a shared common ancestor, and

> So why didn't chimps get some of them? The chimps that did get them we now call humans. There were no chimps back then. We had a shared common ancestor, and subgroups gradually emerged and gradually became different enough that they stopped interbreeding (or were physically separated).