However, other skeletal elements indicate that she spent much of her time clambering through the branches of trees.
In contrast, Lucy’s skeleton is 40 percent complete and dates to about 3.2 mya.
In contrast, a majority of paleoanthropologists, wishing to bring the study of hominins into line with that of other mammals, prefer to assign to molecular clocks to calculate how long species had been separated from a common ancestor.
The molecular clock concept is based on an assumed regularity in the accumulation of tiny changes in the genetic codes of humans and other organisms.
Lucy’s pelvis is more humanlike, and the design of her knee joint suggests that she walked upright in a manner similar to that of modern humans.