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Sources
https://bioteaching.files.wordpress.com/2012/03/img2.
http://www.circlecinema.com/wp-content/uploads/2014/03/Frogs.jpg
http://static.guim.co.uk/sys-images/Media/Pix/pictures/2008/08/04/darwin460.jpg
http://upload.wikimedia.org/wikipedia/commons/a/a5/Jean-Baptiste_de_Lamarck.jpg
http://upload.wikimedia.org/wikipedia/commons/a/ab/Palais_de_la_Decouverte_Tyrannosaurus_rex_p1050042.jpg