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2004 in science
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==Paleontology== * January β A 428 million-year-old fossil ''[[Pneumodesmus]]'' found in [[Scotland]] is identified as the world's oldest known creature to have lived on land.<ref>{{cite news|work=[[BBC News]]|date=2005-01-25|url=http://news.bbc.co.uk/2/hi/uk_news/scotland/3427499.stm|title=Fossil find 'oldest land animal'|access-date=2014-05-25}}</ref> * Summer β A team led by [[Neil Shubin]] discover fossils of the [[Sarcopterygii|sarcopterygian]] ''[[Tiktaalik]]'' on [[Ellesmere Island]] in [[Nunavut]], [[Canada]], significant in the evolution of [[tetrapod]]s.<ref>{{cite journal|journal=[[Nature (journal)|Nature]]|volume=440|pages=757β763|date=6 April 2006|doi=10.1038/nature04639|title=A Devonian tetrapod-like fish and the evolution of the tetrapod body plan|author1=Daeschler, Edward B. |author2=Shubin, Neil H. |author3=Jenkins, Farish A. Jr |pmid=16598249|issue=7085|bibcode = 2006Natur.440..757D |doi-access=free}}</ref>
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