Humans ditched DNA to evolve smooth penises and bigger brains.
References
McLean, C. Y. et al. Nature 471, 216-219 (2011).
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Corbyn, Z. How the penis lost its spikes. Nature (2011). https://doi.org/10.1038/news.2011.148
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DOI: https://doi.org/10.1038/news.2011.148
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