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Unformatted text preview: 6) Second phase Middle Pleistocene Humid interglacial periods cause closed
canopy rain forest to dominate tropical America Providing a route for forest adapted organisms to move northward Threephase Model
Webb & Rancy (1996) Third Phase Late Pleistocene Tropical America suffered massive extinction 56 genera lost, 54 of the 56 were of large body size Due to: Climate Change Human Overkill Mammalian Interchange Mammalian Interchange Summary Graph Aftermath of Interchange
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- Spring '09