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Source:
American Biology Teacher (National Association of Biology Teachers); May 2011, Vol. 73 Issue 5, p281-284, 4p
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Source:
American Biology Teacher (National Association of Biology Teachers); April 2008, Vol. 70 Issue 4, p222-229, 8p
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Source:
American Biology Teacher (National Association of Biology Teachers); October 2000, Vol. 62 Issue 8, p570-576, 7p
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