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Biology; 6th edition; Neil A. Campbell and Jane Reece © 2011 Pearson Education
The Phylogenetic Handbook: A Practical Approach to Phylogenetic Analysis and Hypothesis Testing; 2nd edition; ed. Philippe Lemey, Marco Salemi, and Anne Mieke Vandamme; © 2009 Cambridge University Press
Chapters 18 & 19; Taking Sides: Clashing Views in Science, Technology, and Society; 7th edition; ed. Thomas A. Easton; © 2006 McGraw-Hill Contemporary Learning Series