Final answer:
The toothless man found 1.8 mya showed characteristics of bipedalism and humanlike gait, including small jaws and teeth, skull shape resembling Homo erectus or Homo habilis, and humanlike feet. It also had a larger third molar.
Step-by-step explanation:
The toothless man found 1.8 million years ago showed several characteristics that indicate a bipedal and humanlike gait, similar to modern humans. These characteristics include small jaws and teeth, a skull shape resembling Homo erectus or Homo habilis, a sagittal keel (a raised ridge on top of the skull), and humanlike feet with arches and ankles. The toothless man also had a third molar larger than the other molars, which is a feature found in australopithecines and some early Homo species.