Mesozoikum: Forskelle mellem versioner
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== Kilder/Referencer ==
* ''British Mesozoic Fossils'', 1983, The Natural History Museum, London.
* [http://sciencenow.sciencemag.org/cgi/content/full/2005/929/2 29 September 2005, Science Now: Breathing Easier Since the Jurassic] Citat: "...Atmospheric oxygen levels have fluctuated throughout Earth's history..."
== Eksterne henvisninger ==
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[[ar:حقبة وسطى]]
[[ast:Mesozoicu]]
[[az:Mezozoy]]
[[bg:Мезозой]]
[[br:Mezozoeg]]
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