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http://oceana.org/en/our-work/protect-marine-wildlife/sharks/learn-act/about-sharks
http://www.elasmo-research.org/education/white_shark/digestion.htm
http://www.biodiversityexplorer.org/chondrichthyes/ecology.htm
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0025028
http://www.ms-starship.com/sciencenew/sharks.htm
http://www.ucl.ac.uk/museums-static/obl4he/vertebratediversity/chondrichthyes.html
http://www.sharksinfo.com/life-cycle.html#.U55_YbFlPIU
http://www.supportoursharks.com/en/education/biology/Life_Cycle.htm
http://www.comfsm.fm/~brianl/chondrichthyes.html
http://www.biomedcentral.com/1471-2148/9/218
http://www.nbcnews.com/id/49088488/ns/technology_and_science-science/t/its-all-there-black-white-sharks-are-indeed-color-blind/#.U6Uoy7FlPIU
http://yalikedags.southernfriedscience.com/resource-partitioning-in-sharks-how-predators-get-along/
http://www.ehow.com/facts_6891797_mutualism-big-fish-little-fish.html
http://www.elasmo-research.org/education/white_shark/blood.htm
http://comenius.susqu.edu/biol/202/animals/deuterostomes/vertebrata/chondrichthyes/default.htm
http://www.devoniantimes.org/who/pages/sharks.html
http://www.fao.org/docrep/006/y5261e/y5261e08.htm
http://oceana.org/en/our-work/protect-marine-wildlife/sharks/learn-act/about-sharks
http://www.elasmo-research.org/education/white_shark/digestion.htm
http://www.biodiversityexplorer.org/chondrichthyes/ecology.htm
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0025028
http://www.ms-starship.com/sciencenew/sharks.htm
http://www.ucl.ac.uk/museums-static/obl4he/vertebratediversity/chondrichthyes.html
http://www.sharksinfo.com/life-cycle.html#.U55_YbFlPIU
http://www.supportoursharks.com/en/education/biology/Life_Cycle.htm
http://www.comfsm.fm/~brianl/chondrichthyes.html
http://www.biomedcentral.com/1471-2148/9/218
http://www.nbcnews.com/id/49088488/ns/technology_and_science-science/t/its-all-there-black-white-sharks-are-indeed-color-blind/#.U6Uoy7FlPIU
http://yalikedags.southernfriedscience.com/resource-partitioning-in-sharks-how-predators-get-along/
http://www.ehow.com/facts_6891797_mutualism-big-fish-little-fish.html
http://www.elasmo-research.org/education/white_shark/blood.htm
http://comenius.susqu.edu/biol/202/animals/deuterostomes/vertebrata/chondrichthyes/default.htm
http://www.devoniantimes.org/who/pages/sharks.html