SciShow's video: 5 Times Evolution Should Have Planned Ahead

Natural selection can lead to some pretty amazing adaptations, but sometimes the resulting traits aren’t the most efficient solutions to the problems at hand. With the bar set to “good enough,” here are some features that arose from evolution which get the job done in strange or roundabout ways. Hosted by: Rose Bear Don't Walk SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Silas Emrys, Charles Copley, Jb Taishoff, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Christopher R Boucher, Eric Jensen, LehelKovacs, Adam Brainard, Greg, Ash, Sam Lutfi, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: Photosynthesis http://doi.org/10.2210/rcsb_pdb/mom_2000_11 http://doi.org/10.1199/tab.0130 https://doi.org/10.1042/bss0610001 http://doi.org/10.1098/rstb.2005.1737 https://www.khanacademy.org/science/biology/photosynthesis-in-plants/photorespiration--c3-c4-cam-plants/a/c3-c4-and-cam-plants-agriculture https://doi.org/10.1093/jxb/ern081 https://doi.org/10.1093/jexbot/53.369.569 https://doi.org/10.1111/j.1469-8137.2004.00974.x https://doi.org/10.1016/j.cub.2013.04.066 https://doi.org/10.1093/jxb/erw156 Marsupials http://www.academia.edu/download/45849422/The_marsupial_pouch_implications_for_rep20160522-22723-1vg6ypc.pdf https://books.google.com/books?hl=en&lr=&id=zunYrumtsR8C&oi=fnd&pg=PA213&dq=marsupial+sex+organs&ots=3DsCMRupXv&sig=ReCoxZM96w1nMLWaNIgI_tozEes =onepage&q=marsupial%20sex%20organs&f=false https://doi.org/10.1111/j.1558-5646.2009.00690.x https://www.researchgate.net/publication/228671434_To_replace_or_not_to_replace_The_significance_of_reduced_functional_tooth_replacement_in_marsupial_and_placental_mammals The RLN https://www.science.org.au/curious/earth-environment/why-evolution-isnt-perfect https://www.ncbi.nlm.nih.gov/books/NBK560832/ https://www.ncbi.nlm.nih.gov/books/NBK470179/ https://doi.org/10.4202/app.2011.0019 https://arxiv.org/pdf/1901.01560.pdf Eyes https://evolution.berkeley.edu/evolibrary/article/side_0_0/eyeworks_01 https://www.pbs.org/wgbh/evolution/change/grand/page06.html https://dx.doi.org/10.1038%2Fnrn2283 https://doi.org/10.1007/s12052-008-0091-2 https://doi.org/10.1038/eye.2017.226 Bipedalism https://www.sciencemag.org/news/2013/02/human-evolution-gain-came-pain https://doi.org/10.3390/biomimetics4030060 https://doi.org/10.1038/46965 https://journals.co.za/doi/10.10520/AJA00382353_7777 https://doi.org/10.1002/ajpa.10058 https://jaoa.org/aoa/content_public/journal/jaoa/938176/622.pdf Image Sources: https://www.istockphoto.com/photo/human-evolution-concept-gm534666343-57025144 https://www.istockphoto.com/photo/small-plant-growing-in-garden-with-sunlight-gm1098175106-294925383 https://www.istockphoto.com/photo/close-up-of-agave-succulent-plants-selective-focus-toning-gm644186460-116811255 https://www.istockphoto.com/photo/ripe-sorghum-milo-millet-crop-field-in-rows-gm503285337-44539474 https://www.istockphoto.com/photo/a-mother-opossum-with-its-four-babies-on-the-pavement-gm145992459-6021241 https://www.istockphoto.com/photo/kangaroo-and-joey-gm183412961-15481964 https://www.istockphoto.com/photo/koala-with-joey-gm1043281514-279279126 https://www.istockphoto.com/photo/pretty-faced-wallaby-gm1187266245-335312813 https://www.istockphoto.com/photo/western-grey-kangaroos-hopping-in-the-pinnacles-desert-near-cervantes-in-western-gm1280454033-378751604 https://commons.wikimedia.org/wiki/File:Recurrent_laryngeal_nerve.svg https://commons.wikimedia.org/wiki/File:GiraffaRecurrEn.svg https://www.istockphoto.com/photo/morula-early-stage-embryo-gm1199299494-343074205 https://commons.wikimedia.org/wiki/File:Guiyu_BW.jpg https://www.istockphoto.com/photo/human-dark-brown-eyes-close-up-side-look-gm1207350570-348567451 https://en.wikipedia.org/wiki/File:Evolution_eye.svg https://www.istockphoto.com/photo/common-octopus-gm894399752-247279301 https://www.istockphoto.com/photo/pharaoh-cuttlefish-sepia-pharaonis-his-right-eye-north-sulawesi-indonesia-gm97881808-12318152 https://www.eurekalert.org/multimedia/pub/196779.php https://commons.wikimedia.org/wiki/File:Diagram_of_eye_evolution.svg https://www.istockphoto.com/photo/running-on-tracks-gm616002088-107046357 https://commons.wikimedia.org/wiki/File:Stegosaurus_Senckenberg_white_background.jpg https://www.istockphoto.com/photo/3d-illustration-of-human-body-spinal-bone-anatomy-gm952777260-260108613