Word: diamonded
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...Diamond, author of the Pulitzer Prize-winning Guns, Germs, and Steel: The Fates of Human Societies, said the human population has homogenized because of changes in lifestyle that he called "agricultural expansion...
...Diamond said the main factor behind the evolution of different regions at different rates was the domestication of various animals and crops...
...Diamond explained the differences in evolution on different continents in terms of their geography. He said that because the continents were stretched out on different axes, migration was different on each...
...Diamond said the reason for this phenomenon is that Eurasia stretches 10,000 miles from east to west, whereas the Americas stretch 10,000 miles from north to south...
...contrast is even more striking in Africa, Diamond said. In the fertile crescent, in the area of the Persian Gulf, cultivation was always easy and fruitful. In the warmer climates in the rest of Africa, such agriculture was impossible, thus preventing the spread of culture and people since those who were successful in agriculture stayed put for the most part...