GCSE Biology Revision "Evolution by Natural Selection"

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In this video, we look at how species evolve through natural selection.

This video is based on the AQA spec. If you are following a different exam board then you should check your specification.

Image credits:

Elephant By Charlesjsharp - Own work, from Sharp Photography, sharpphotography, CC BY-SA 4.0, https://commons.wikimedia.org/w/index...

Tiger By Dibyendu Ash - The image of tiger's facial marking (Sultan or T72) had been photographed from Ranthambhore Tiger Reserve, Rajasthan, India on 12.10.2014.Previously published: Yes, this file has been previously published in my social networking profiles; I am yet to share this file with other conservation and zoological portals and websites., CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

Arctic wolf By tsaiproject - original upload on flickr by tsaiproject, CC BY 2.0, https://commons.wikimedia.org/w/index...

Giraffe By Alvesgaspar - Self-photographed, GFDL, https://commons.wikimedia.org/w/index...

Clownfish By Nhobgood Nick Hobgood - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

Tuna "https://commons.wikimedia.org/wiki/Fi...

By Takashi Hososhima (https://www.flickr.com/photos/htakash...) [CC BY-SA 2.0 (https://creativecommons.org/licenses/...)], via Wikimedia Commons"

Cypress "https://commons.wikimedia.org/wiki/Fi...

By Melburnian (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/b...) or CC BY 2.5 (http://creativecommons.org/licenses/b...)], via Wikimedia Commons"

Fern By Hugh Chevallier, CC BY-SA 2.0, https://commons.wikimedia.org/w/index...

Ladybird "https://commons.wikimedia.org/wiki/Fi...

Author: Dominik Stodulski"

Cetonia-aurata "https://commons.wikimedia.org/wiki/Fi...

I, Chrumps [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/b...) or CC BY-SA 2.5 (https://creativecommons.org/licenses/...)], via Wikimedia Commons"

Caterpillar By I, Svdmolen, CC BY 2.5, https://commons.wikimedia.org/w/index...

Earth By NASA/Apollo 17 crew; taken by either Harrison Schmitt or Ron Evans - https://web.archive.org/web/201601121... (image link); see also https://www.nasa.gov/multimedia/image..., Public Domain, https://commons.wikimedia.org/w/index...

Wild konijn By Wutsje / Wikimedia Commons, CC BY-SA 4.0, https://commons.wikimedia.org/w/index...
2007-07-

Rabbit By Vera Buhl - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

Ostpark_Kaninchen_1806011 By Total number of my uploaded files:888 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

Parcul_de_Animale_-_"Moara_de_Vant"_(8110151035) By Cristian Bortes www.eyeem.com/bortescristian from Cluj-Napoca, Romania -

Parcul de Animale - "Moara de Vant", CC BY 2.0, https://commons.wikimedia.org/w/index...

Parcul_de_Animale_-_"Moara_de_Vant"_(8110148352) By Cristian Bortes www.eyeem.com/bortescristian from Cluj-Napoca, Romania -

Parcul de Animale - "Moara de Vant", CC BY 2.0, https://commons.wikimedia.org/w/index...

Oryctolagus_cuniculus_(Germany,Eppelheim) "https://commons.wikimedia.org/wiki/Fi...

By Thorsten Denhard (Own work) [CC BY-SA 3.0 (https://creativecommons.org/licenses/...)], via Wikimedia Commons"

Oryctolagus_cuniculus_juvenile_(Germany,Eppelheim) By Thorsten Denhard - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index...

Snow bunny By USFWS Mountain-Prairie - Snow Bunny, Public Domain, https://commons.wikimedia.org/w/index...

Fox "https://commons.wikimedia.org/wiki/Fi...

By Peter Trimming from Croydon, England (Fox Portrait) [CC BY 2.0 (http://creativecommons.org/licenses/b...)], via Wikimedia Commons"

Pygmy rabbit By U.S. Government National Park Service - http://www.nps.gov/media/photo/galler..., Public Domain, https://commons.wikimedia.org/w/index...

Music credit:

Deliberate Thought by Kevin MacLeod is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/...)
Source: http://incompetech.com/music/royalty-...
Artist: http://incompetech.com/