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Citations
Book- Marieb, Elaine Nicpon. Human anatomy & physiology. 6th ed. ed. San Francisco, Calif.: Pearson Benjamin Cummings, 2004. Print.
Picture-http://highered.mheducation.com/sites/dl/free/0072507470/234415/mc_ch01_fig06.jpg
"Ectoderm." - Wikipedia, the Free Encyclopedia. N.p., n.d. Web. 31 Aug. 2014.
"Mesoderm." - Wikipedia, the Free Encyclopedia. N.p., n.d. Web. 31 Aug. 2014.
"Endoderm." - Wikipedia, the Free Encyclopedia. N.p., n.d. Web. 31 Aug. 2014.