How can anyone observe the human Pie-Hole and believe that it evolved? It's irreducibly complex.
It is very much reducible, that's the point. Evolution proceeds hierarchically - once something works (be it external forms like teeth or general skeleton plan of mammals, or biochemical cholineesterase cycle in nerve transmission)- it is carried on in successive forms as a large unitary building block with only relatively minor modifications [i.e. no longer is randomized] - that's why the same anticholineesteratics are working against both cockroaches and humans. And it is not a result of external intelligence application, but merely the shortest natural pathway of evolution. Otherwise it would take forever.