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# [[Chemical Evolution]] (the development of the larger elements from hydrogen)
# [[Chemical Evolution]] (the development of the larger elements from hydrogen)
Only the fifth phase has been observed and documented. The first four are assumed. [http://www.allaboutscience.org/origin-of-life.htm]
Only the fifth phase has been observed and documented. The first four are assumed. <ref>http://www.allaboutscience.org/origin-of-life.htm</ref>
==References==
<references/>
[[Category:Evolution]]
[[Category:Evolution]]