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We don’t know which living thing was the very first to arrive at the totally revolutionary process that is sexual reproduction but we can follow the history of how (and why) sex became a thing.
Thanks to Studio 252mya for their illustrations. You can find more of their work here: https://252mya.com/licensing
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References:
http://science.sciencemag.org/content/319/5870/1660.long
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4413262/#s4title
https://news.nationalgeographic.com/news/2008/04/080401-first-sex.html
https://www.nature.com/scitable/topicpage/sexual-reproduction-and-the-evolution-of-sex-824
http://www.indiana.edu/~curtweb/Research/Red_Queen%20hyp.html
http://cshperspectives.cshlp.org/content/6/3/a016154.full
http://www.genetics.org/content/181/1/3.full
https://www.scientificamerican.com/article/fossils-rewrite-history-of-sex/
https://www.ncbi.nlm.nih.gov/pubmed/19464181
https://www.britannica.com/science/Ediacara-fauna
https://www.the-scientist.com/?articles.view/articleNo/40333/title/The-Sex-Paradox/
https://www.britannica.com/science/reproduction-biology/Reproduction-of-organisms#ref607656
http://cshperspectives.cshlp.org/content/6/1/a016121.full
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4640172/
https://www.britannica.com/animal/Hydra-hydrozoan-genus
https://www.britannica.com/science/algae/Reproduction-and-life-histories
https://www.britannica.com/science/meiosis-cytology
https://www.reuters.com/article/us-science-plant/fossils-from-1-6-billion-years-ago-may-be-oldest-known-plants-idUSKBN16L2GH
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