Is It Caused by the Physiognomy of Our Vocal Tract?

The physiognomy of our vocal tract affects the kind of sound products we're doing. It might be normal for them to use some sounds or sound combinations more than others because they're less effortful. Hoots and grunts and pants happened most reliably in the first position in by grams. If you had two in a row, then the first one was going to be hoot, grunt and pant.