Pro: What is Yali’s question?
3: How does Pizarro’s capture of Atahuallpa explain why Europeans colonied the New World instead of Native Americans colonizing Europe?
4: How did the availability of domestic plants and animals explain why empire, literacy, and steel weapons developed earliest in Eurasia?
6: What factors contributed to hunter-gatherers becoming farmers?
10: How did axis orientations of continents affect the success or non-success of human beings in various areas of the world?
11: How does the role of germs figure in answering Yali’s question?
12: Why did writing arise in and spread to some societies and not to many others?
13: Under what kinds…

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Teachers please help. Is there any difference in meaning/context? how best to explain it to my students? Thanks.