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1. Jenkins, Steve.
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2. "Skeleton," Encyclopedia Brittanica, accessed May 14, 2012. http://www.britannica.com/EBchecked/topic/547371/skeleton#toc41991.
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3. Martini, Frederic.
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4. "Dem Bones," Kidzworld, last modified December 27, 2006, http://www.kidzworld.com/article/922–dem–bones#.
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5. Martini, Frederic.
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6. Ibid. 218–219.
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7. Stewart, Bill, "The Skeletal System" (lecture, New Haven, CT, March 6, 2012).
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8. Gross, Ruth Belov.
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9. Jenkins, Steve. Bones.
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10. Martini, Frederic.
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11. Ibid. 225.
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12. "Human Skeleton,"
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13. Jenkins, Steve.
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14. Martini, Frederic.
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15. Ibid. 228–232.
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16. Solway, Andy.
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17. Martini, Frederic.
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18. Solway, Andy. The Skeletal System, The Muscular System. 28–29.
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19. "Evolution,"
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20. Ruiz, Andres Llamas.
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21. Shubin, Neil.
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22. Jenkins, Steve.
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23. Ibid. 18.
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24. Ibid. 20.
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25. Frisby, Holly, "Reptile Guide,"
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26. "Snake Skeleton,"
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27. Frisby, Holly, "Reptile Guide,"
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28. "Skeleton,"
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29. "Shark,"
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30. Ibid.
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31. "Shark Anatomy," Enchanted Learning, accessed June 27, 2012, http://www.enchantedlearning.com/subjects/sharks/anatomy/Teeth.shtml.
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32. "Shark Anatomy," Enchanted Learning, accessed June 27, 2012, http://www.enchantedlearning.com/subjects/sharks/anatomy/.
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33. "The Skeleton,"
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34. Switek, Brian, "Why a Pterosaur is not a Dinosaur,"
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35. Pterosaur.net, accessed July 2, 2012, http://pterosaur.net/.
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36. "Anatomy,"
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37. "Ecology,"
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38. "Pterosaur,"
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39. "Bird,"
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40. "Bird Skeleton,"
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41. "All About Bats,"
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42. Ramel, Gordon, "Bat Anatomy,"
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43. "Bat,"
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44. Ramel, Gordon, "Bat Anatomy,"
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45. Jenkins, Steve.
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46. Echevarría et al.
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English Learners. 5.
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47. Ibid. 17.
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48. Project G.L.A.D, accessed May 12, 2012, www.projectglad.com
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49. Echevarría et al. Making
Content Comprehensible for
English Learners. 139–140.