Does evolution ever reverse itself? Regressive evolution means that animals or organisms lose some of the complexity they had in the past. There's one specific group of animals that really dived into reverse evolution: whales, dolphins, seals, and sea turtles. They've really changed a lot over the last 350 million years, moving from sea to dry land and back to sea! #brightside Credit: NASA/Earth Science and Remote Sensing Unit, Lyndon B. Johnson Space Center Black sheep: Jesus Solana, CC BY 2.0 https://creativecommons.org/licenses/by/2.0/, https://commons.wikimedia.org/wiki/File:Black_sheep-1.jpg Ice age: Mauricio Antón, CC BY 2.5 https://creativecommons.org/licenses/by/2.5/, https://commons.wikimedia.org/wiki/File:Ice_age_fauna_of_northern_Spain_-_Mauricio_Ant%C3%B3n.jpg CC BY-SA 2.5 https://creativecommons.org/licenses/by-sa/2.5/: Astrophytum asterias: Dr. David Midgley, https://en.wikipedia.org/wiki/File:Astrophytum_asterias1.jpg Glomeris marginata: Stemonitis https://en.wikipedia.org/wiki/File:Glomeris_marginata_1.jpg Rhagoletis pomonella: Joseph Berger, Bugwood.org, CC BY 3.0 https://creativecommons.org/licenses/by/3.0/, https://en.wikipedia.org/wiki/File:Rhagoletis_pomonella.jpg CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/: Toby Hudson: Labeotropheus https://commons.wikimedia.org/wiki/File:Labeotropheus_sp_Lake_Malawi_Cichlid_pale_femelle.jpg Maylandia https://commons.wikimedia.org/wiki/File:Maylandia_lombardoi_male_Lake_Malawi_Cichlid_yellow.jpg Cichlid blue https://commons.wikimedia.org/wiki/File:Lake_Malawi_Cichlid_blue.JPG Pinicola enucleator: Cephas https://commons.wikimedia.org/wiki/File:Pinicola_enucleator_m_CT2.jpg Doc. RNDr. Josef Reischig, CSc.: Cyanobacteria https://commons.wikimedia.org/wiki/File:Cyanobacteria_(248_08)_Mixture;_native_preparation;_green_filter.jpg Cyanobacteria https://commons.wikimedia.org/wiki/File:Cyanobacteria_(248_07)_Mixture;_native_preparation;_green_filter.jpg Sphaeromyxa hellandi: Ivan Fiala https://commons.wikimedia.org/wiki/File:Sphaeromyxahellandi.jpg Cyprinidae: Hectonichus https://commons.wikimedia.org/wiki/File:Cyprinidae_-_Phreatichthys_andruzzii.JPG Astyanax mexicanus: H. Zell, https://commons.wikimedia.org/wiki/File:Astyanax_mexicanus_01.jpg Bottlenose dolphin: Peter Asprey, http://www.peter-asprey.com/, https://commons.wikimedia.org/wiki/File:Bottlenose_dolphin_with_young.JPG Euphorbia obesa: Frank Vincentz, https://en.wikipedia.org/wiki/File:E_obesa_symmetrica_ies.jpg Armadillidium vulgare: Franco Folini https://en.wikipedia.org/wiki/File:Armadillidium_vulgare_001.jpg CC BY 4.0 https://creativecommons.org/licenses/by/4.0/: Homo neanderthalensis: Jakub Hałun https://commons.wikimedia.org/wiki/File:Homo_neanderthalensis,_The_Natural_History_Museum_Vienna,_20210730_1223_1268.jpg Symbiotic nitrogen: LegumeLover, https://commons.wikimedia.org/wiki/File:Symbiotic_nitrogen_fixing_bacteria_inside_legume_root_nodule_cells.tif Parasite: Marcelo Knoff, Simone Chinicz Cohen, Melissa Querido Cárdenas, Jorge M. Cárdenas-Callirgos and Delir Corrêa Gomes https://commons.wikimedia.org/wiki/File:Parasite140121-fig3_Pseudorhabdosynochus_jeanloui_(Monogenea,_Diplectanidae)_Fig3d_Squamodisc_SEM.png CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/: Invertebrate montage: Dan Parsons, François Michonneau, Nhobgood, Sanjay Acharya, jbrasher, Jnpet, GlebK, Bernard DUPONT, Schokraie E, Warnken U, Hotz-Wagenblatt A, Grohme MA, Hengherr S, et al. (2012) https://commons.wikimedia.org/wiki/File:Invertebrate_montage_(2022).jpg Lucy: Neanderthal-Museum, Mettmann https://commons.wikimedia.org/wiki/File:Australopithecus_afarensis_(%E2%80%9ELucy%22)_Rekonstruktion_mit_M%C3%A4dchen.jpg Shark eggs: Yohanes Wahyu Nurcahyo https://commons.wikimedia.org/wiki/File:Shark_Eggs.jpg Cladoselache: Armin Reindl https://commons.wikimedia.org/wiki/File:Cladoselache_NHMW.jpg Saaser Mutte: Namma! https://commons.wikimedia.org/wiki/File:Saaser_Mutte_ProSpecieRara_8.jpg Animation is created by Bright Side. —————————————————————————————- Music by Epidemic Sound https://www.epidemicsound.com Check our Bright Side podcast on Spotify and leave a positive review! https://open.spotify.com/show/0hUkPxD34jRLrMrJux4VxV Subscribe to Bright Side: https://goo.gl/rQTJZz —————————————————————————————- Our Social Media: Facebook: https://www.facebook.com/brightside Instagram: https://www.instagram.com/brightside.official TikTok: https://www.tiktok.com/@brightside.official?lang=en Stock materials (photos, footages and other): https://www.depositphotos.com https://www.shutterstock.com https://www.eastnews.ru —————————————————————————————- For more videos and articles visit: http://www.brightside.me
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