Description

Researched and Written by Leila Battison
Narrated and Edited by David Kelly
Art by Khail Kupsky
Thumbnail Art and Art by Ettore Mazza



If you like our videos, check out Leila’s youtube channel:



https://www.youtube.com/channel/UCXIk7euOGq6jkptjTzEz5kQ



Music from Epidemic Sound and Artlist.



Image credits:



Mimoperadectes By Jorge González - Horovitz I, Martin T, Bloch J, Ladevèze S, Kurz C, et al. (2009) Cranial Anatomy of the Earliest Marsupials and the Origin of Opossums. PLoS ONE 4(12): e8278. doi:10.1371/journal.pone.0008278.g006, CC BY 2.5, https://commons.wikimedia.org/w/index.php?curid=8760185



Snowball Earth Oleg Kuznetsov - 3depix -  http://3depix.com/, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons



Cyanobacteria By CSIRO, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=35480947



Oviraptor By Jordi Payà from Barcelona, Catalonia - IMG_1215&039;Uploaded by FunkMonk, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=13528130



Oviraptor skull By Jaime A. Headden - https://qilong.wordpress.com/2011/06/05/better-know-an-oviraptorid-the-first-egg-thief/, CC BY 3.0, https://commons.wikimedia.org/w/index.php?curid=43149014



Megazostrodon Reconstruction By Theklan - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=57277071



Coryphodon By Jonathan Chen - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=79994238



Amoeba By Cymothoa exigua - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=24395008



University of Bonn Electorial Building By I, Der Wolf im Wald, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=2462942



Poppelsdorfer Alle By Itamar Medeiros - Imported from 500px (archived version) by the Archive Team. (detail page), CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=71280017



 Chloroplasts visible in the cells of Bryum capillare By Des_Callaghan - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=35894254



Liverwort_chloroplasts By Smith609 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=4487231



Oxpecker on Impala By Charles James Sharp - Self-photographed, from Sharp Photography, sharpphotography.co.uk, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=67815562



Oxpecker on mammal By Prosthetic Head - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=48532556



Yellow-billed oxpecker on a wildebeest By Lip Kee Yap from Singapore, Republic of Singapore - Yellow-billed Oxpecker (Buphagus africanus), CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=5267777 



A disruptively patterned white-spotted puffer being cleaned by a conspicuously coloured Hawaiian cleaner wrasse.  By Brocken Inaglory - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=10477834 



Remora By RyanSomma - originally uploaded to Flickr as Common Remora, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=11066367



Nurse shark with remoras Duncan Wright (User:Sabine’s Sunbird), CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons



Chlorophyll Cells By Kristian Peters – Fabelfroh - Self-photographed, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1350193



Amobe By Picturepest - Amöbe? 400x, 12my - Fokalebene 1, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=39164966



Chrondocyte By Robert M. Hunt - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=7194969



A fluorescent image of an endothelial cell. 
By IP69.226.103.13 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=8093704 



Cellular universe By Annaleida - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=44980851



Human Cheek Cells stained with Methylene Blue under 400x magnification By Fritzmann2002 - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=64616939 



Cèl·lules de la mucosa bucal. By Pere López Brosa, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=71049970 



Dolly the sheep By Paul Hudson from United Kingdom - National Museum of Scotland, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=83267384



black widow By Ken-ichi Ueda - https://www.inaturalist.org/photos/121, CC BY 4.0, https://commons.wikimedia.org/w/index.php?curid=74873884



Cell division by 42 By Egelberg - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=22558546



Spermatozoa By Vasin-ks - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=45364328



Meosis By Doc. RNDr. Josef Reischig, CSc. - Author&039;s archive, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=31034009



Mitochondrion By Kelvinsong; modified by Sowlos - Own work based on: Mitochondrion mini.svg, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=27731882