During their analysis of fossils from Hadar and Laetoli, Donald Johanson, Tim White and their colleagues examine several features f the dentition, jaws and skulls of apes and humans. In what ways do apes and humans differ with respect to each of those features? Do the fossil hominids from Hadar and Laetoli more closely resemble humans or apes with respect to each of those features? How did these observations influence how Johanson and White interpreted these fossils?