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In addition, publication of the chimpanzee genome has allowed scientists to compare chimp and human genetic sequences, and to use the differences between them to estimate the date of divergence of the two species.

The result suggests humans and chimps diverged "no more than 6.3 million years ago and perhaps even more recently than 5.4 million years ago" (Pennisi 2006). Its remains are fragmentary, consisting of some limb bones, partial jaw material, and a few teeth.

The scientist Ernst Haeckel, for example, was convinced that humanity's nearest common ancestor was the orang-utan, and that humans evolved in Asia.

Though wrong in this, he was a persuasive writer and many people came to accept his view.

Michel Brunet's team describe Sahelanthropus as a hominid, for reasons including the shape and angle of the face and skull, and its dentition.

would be better placed in Australopithecus - an example of how rapidly our understanding of our evolutionary past is changing, and of the reviews, discussion and disagreements that characterise scientific research.

The best-known member of this species is "Lucy" , discovered in 1974 by Don Johanson & Tom Gray and estimated to be around 3.2 million years old (afarensis lived from 3.9 to 3 million years ago).

Our knowledge of human evolution is changing rapidly, as new fossils are discovered and described every year.

Thirty years ago, it was generally accepted that humans and the great apes last shared a common ancestor perhaps 16-20 million years ago, and that the separate human branch was occupied by only a few species, each evolving from the one before.

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