http://digfir-published.macmillanusa.com/hlw_2D_animation/animation_02_2203.html
Chapter
1. Speciation by Vicariance
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http://digfir-published.macmillanusa.com/hlw_2D_animation/animation_02_2203_dlap.xmlDLAP questions5838c4d5757a2e3f74000006