An explanation of the Cambrian explosion. All pictures are from Google. “What Sparked the Cambrian Explosion?”: https://www.scientificamerican.com/article/what-sparked-the-cambrian-explosion1/ “Oxygen, animals and oceanic ventilation: an alternative view”: https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1472-4669.2009.00188.x “Oxygen, ecology, and the Cambrian radiation of animals”: http://www.pnas.org/content/110/33/13446 “Oxygen and predators and Cambrian awesomeness (with worms!)”: https://cambrianmammal.wordpress.com/2013/08/14/oxygen-and-predators-and-cambrian-awesomeness-with-worms/ “Self-Recognition and Ca2+-Dependent Carbohydrate–Carbohydrate Cell Adhesion Provide Clues to the Cambrian Explosion”: https://academic.oup.com/mbe/article/26/11/2551/1015449?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Cambrian&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT “Biotic replacement and mass extinction of the Ediacara biota”: http://rspb.royalsocietypublishing.org/content/282/1814/20151003 “The origin of the animals and a ‘Savannah’ hypothesis for early bilaterian evolution”: https://onlinelibrary.wiley.com/doi/full/10.1111/brv.12239 “The Tommotian Fauna - the small shelly animals”: http://www.fossilmuseum.net/Paleobiology/Tommotian_fauna.htm “Kimberella”: https://en.wikipedia.org/wiki/Kimberella “Wiwaxia”: http://www.prehistoric-wildlife.com/species/w/wiwaxia.html “Orthrozanclus”: https://en.wikipedia.org/wiki/Orthrozanclus “Ottoia”: https://en.wikipedia.org/wiki/Ottoia “Tardigrada (water...
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