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Credits:
Hank Green – Executive Producer / Host / Writer
Blake De Pastino – Chief Editor
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Sources:
The Mechanical Behavior of Shark Skin – http://www.ias.ac.in/jarch/jbiosci/22/431-437.pdf
Importance of Cartilage – http://www.elasmo-research.org/education/topics/p_cartilage.htm
FISH TO TETRAPODS – http://en.wikipedia.org/wiki/Evolution_of_fish#Fish_to_tetrapods
Leydig’s Organ – http://en.wikipedia.org/wiki/Leydig%27s_organ
Chondrychthyes – http://en.wikipedia.org/wiki/Chondrichthyes
Osteichthyes – http://en.wikipedia.org/wiki/Osteichthyes
Evolution of Fish – http://en.wikipedia.org/wiki/Evolution_of_fish