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维基百科，自由的百科全书

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Phylogenetic Tree of Life. Copy of image from en.wikipedia.org.

Original source: http://nai.arc.nasa.gov/library/images/news_articles/big_274_3.jpg from http://nai.arc.nasa.gov/news_stories/news_detail.cfm?ID=274

A phylogenetic tree of living things, based on RNA data, showing the separation of bacteria, archaea, and eukaryotes. Trees constructed with other genes are generally similar, although they may place some early-branching groups very differently, thanks to long branch attraction. The exact relationships of the three domains are still being debated, as is the position of the root of the tree. It has also been suggested that due to lateral gene transfer, a tree may not be the best representation of the genetic relationships of all organisms. For instance some genetic evidence suggests that eukaryotes evolved from the union of some bacteria and archaea (one becomeing the nucleus and the other the main cell).

[edit] Licensing

I, the author of this work, hereby publish it under the following license:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

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Image:PhylogeneticTree.png

维基百科，自由的百科全书

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