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1 Why Evolution Is True, Jerry Coyne, Viking, 2009.
2 A Cambrian Peak in Morphological Variation Within Trilobite Species, Mark Webster, Science, July 27, 2007.
Terry Devitt, editor; Nathan Hebert, project assistant; S.V. Medaris, designer/illustrator; David Tenenbaum, feature writer; Amy Toburen, content development executive