Answer:
The anthropologist Mary Leakey used the different excavations that she realized between 1934 and 1981 to determine what were the thoughts and felts from early humans, like the Australopithecus boisei, Homo habilis or Homo erectus, using their skulls, bones and primitive instruments.
Step-by-step explanation:
How Mary Leakey was an anthropologist, all her studies are based in her excavations, by that reason, the text is centered in this.