Dinesh's photos with the keyword: II excerpt

The pattern of change in the environments of Africa helped to shape the evolution of the hominid lineage. In the late Miocene, the tropical rain forest that once dominated the continent began to give way to savanna and open woodlands. Over the next 10 million years, polar glaciers exerted a profound effect. Cooler temperatures and lower rainfall during glacial periods shrunk the forest into scattered patches, isolating the species within them. The rain forest expanded again in the warmer, wetter periods between glacial advances, bringing together species that evolved in isolation. en.wikipedia.org/wiki/Miocene en.wikipedia.org/wiki/Interglacial