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Source:
American Biology Teacher (National Association of Biology Teachers). Oct2008, Vol. 70 Issue 8, p472-477. 6p. 1 Black and White Photograph, 3 Diagrams.
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American Biology Teacher (National Association of Biology Teachers); May 2011, Vol. 73 Issue 5, p281-284, 4p
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American Biology Teacher (National Association of Biology Teachers); April 2008, Vol. 70 Issue 4, p222-229, 8p
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American Biology Teacher (National Association of Biology Teachers). Jan2009, Vol. 71 Issue 1, p8-8. 1p.
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American Biology Teacher (National Association of Biology Teachers); Apr2004, Vol. 66 Issue 4, p257-267, 10p
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American Biology Teacher (National Association of Biology Teachers); Apr2004, Vol. 66 Issue 4, p268-276, 9p
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American Biology Teacher (National Association of Biology Teachers); November/December 2003, Vol. 65 Issue 9, p697-700, 4p
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