Changes

A study published by Clark and Nielsen of [[Cornell University]] in the December 2003 AD issue of the journal ''[[Science (journal)|Science]]'' highlights differences related to one of humankind's defining qualities — the ability to understand [[language]] and to communicate through speech. These macro-phenotypic differences, however, may owe less to physiology than might be assumed given that ''Homo sapiens'' developed modern cultural features long after the modern physiological features were in place and indeed competed averagely against other species of ''Homo'' with regard to tools, etc for many millennia. Differences also exist in the genes for smell, in genes that regulate the metabolism of amino acids and in genes that may affect the ability to digest various proteins.  

A study published by Clark and Nielsen of [[Cornell University]] in the December 2003 AD issue of the journal ''[[Science (journal)|Science]]'' highlights differences related to one of humankind's defining qualities — the ability to understand [[language]] and to communicate through speech. These macro-phenotypic differences, however, may owe less to physiology than might be assumed given that ''Homo sapiens'' developed modern cultural features long after the modern physiological features were in place and indeed competed averagely against other species of ''Homo'' with regard to tools, etc for many millennia. Differences also exist in the genes for smell, in genes that regulate the metabolism of amino acids and in genes that may affect the ability to digest various proteins.  

===Fossils===

===Fossils===

Many [[Human evolution|human fossils]] have been found, but chimpanzee fossils were not described until 2005 AD. Existing chimpanzee populations in West and Central Africa do not overlap with the major human fossil sites in East Africa. However, chimpanzee fossils have now been reported from [[Kenya]]. This would indicate that both humans and members of the ''Pan'' [[clade]] were present in the East African [[Rift Valley]] during the Middle [[Pleistocene]].<ref name=firstfossil>{{cite journal | title = First fossil chimpanzee | last = McBrearty | first = S. | coauthors = N. G. Jablonski | journal = [[Nature (journal)|Nature]] | date = 2005-09-01 | volume = 437 | pages = 105-108 | id = {{Entrez Pubmed|16136135}}}}</ref>

Many [[Human evolution|human fossils]] have been found, but chimpanzee fossils were not described until 2005 AD. Existing chimpanzee populations in West and Central Africa do not overlap with the major human fossil sites in East Africa. However, chimpanzee fossils have now been reported from [[Kenya]].  

 

[[Category:Mammals]]

[[Category:Mammals]]