Without a proper jaw shape and teeth, a working dog is useless. (abneycatahoulas.com)
The distinct jaw shapes of A. deyiremeda and A. afarensis could mean that they used their teeth on different kinds of food. (scientificamerican.com)
On land, the difference in density between air and food makes that mechanism a no - go, and helpful adaptations such as tongues and specialized jaw shapes would not evolve until millions of years after the transition to land. (discovermagazine.com)