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"Evolution: Change: Deep Time." PBS. WGBH Educational Foundation, n.d. Web. 10 Nov. 2014.
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Ghose, Tia. "Reference: Mesozoic Era: The Age of Reptiles." Live Science. Purch, 1 Aug. 2013. Web. 10 Nov. 2014.
Hamilton, Jason. "The Cenozoic Era." Science views. Calvin & Rosanna Hamilton, n.d. Web. 11 Nov. 2014.
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Pappas, Stephanie. "Paleozoic Era: Facts & Information." Live Science. Purch, 19 June 2013. Web. 9 Nov. 2014.
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Smith, Dave. "The Cenozoic Era." UCMP. N.p., Nov. 2002. Web. 11 Nov. 2014.
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Zimmermann, Kim Ann. "Cenozoic Era: Facts About Climate, Animals & Plants." Live Science. Purch, 10 Oct. 2013. Web. 11 Nov. 2014.
Bagley, Mary. "Precambrain:Facts About the Begining of Time." LiveScience. Purch, 12 Feb. 2014. Web. 7 Nov. 2014.
"Evolution: Change: Deep Time." PBS. WGBH Educational Foundation, 2001. Web. 10 Nov. 2014.
"Evolution: Change: Deep Time." PBS. WGBH Educational Foundation, n.d. Web. 10 Nov. 2014.
"Evolution: Change: Deep Time." PBS. WGBH Educational Foundation, n.d. Web. 12 Nov. 2014.
Ghose, Tia. "Reference: Mesozoic Era: The Age of Reptiles." Live Science. Purch, 1 Aug. 2013. Web. 10 Nov. 2014.
Hamilton, Jason. "The Cenozoic Era." Science views. Calvin & Rosanna Hamilton, n.d. Web. 11 Nov. 2014.
---. "The Mesozoic Era." Science Views. Calvin & Rosanna Hamilton, n.d. Web. 10 Nov. 2014.
---. "The Paleozoic Era." Science Views. calvin & Rosanna Hamilton, n.d. Web. 9 Nov. 2014.
Pappas, Stephanie. "Paleozoic Era: Facts & Information." Live Science. Purch, 19 June 2013. Web. 9 Nov. 2014.
"Precambrian Time." national geographic. national geographic society, n.d. Web. 8 Nov. 2014.
Smith, Dave. "The Cenozoic Era." UCMP. N.p., Nov. 2002. Web. 11 Nov. 2014.
---. "The Paleozoic Era." UCMP. N.p., 29 June 2011. Web. 9 Nov. 2014.
Zimmermann, Kim Ann. "Cenozoic Era: Facts About Climate, Animals & Plants." Live Science. Purch, 10 Oct. 2013. Web. 11 Nov. 2014.