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Linnaeus, concerned exclusively with similarities in bodily structure, faced only the problem of distinguishing is a matter of active debate.

Some paleoanthropologists extend the span of this species far back into time to include many anatomically distinctive fossils that others prefer to allocate to several different extinct species.

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.

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They had small (ape-sized) braincases and rather protruding faces.

Given these apelike cranial proportions, it is hardly surprising that many paleoanthropologists have characterized these early hominins as “ from Hadar, Ethiopia.

Human evolution, it appears, has consistently been a process of trial and error.

Historically, this process has been considered a more or less direct series of assumed improvements within a single lineage that eventually culminated in the burnished “perfection” of .

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