After, human evolution originated in Africa, they started move out of Africa to populate the entire globe. ... Thousands of years ago there was a dramatic climate change in Africa continent. ... Scientists believe that a small group of people left Africa and took few generations to migrate all the way from Africa to populate North America. ... In other words, scientists believed that all humans are children of Africa because they could track DNA from today people back from DNA of human remains found in people from Africa. ... Additional evidence of the first inhabitants of North America came ...

• Word Count: 2012
• Approx Pages: 8
• Has Bibliography
• Grade Level: Undergraduate

In other words, it was the separation of North and South American from Eurasia and Africa. ... The great Exchange concerned both the West and the East in the exchange of goods, animals, slaves, plants, and ideas. ... When Europeans first grazed the borders of the Americas, Old World crops had not traveled west across the Atlantic and New World crops had not traveled east to Europe. ... New World crops such as maize, white potatoes, sweet potatoes, and manioc had not traveled east to Europe. ... This economy had a devastating effect on Africa and reaped agricultural wealth and materials from t...

• Word Count: 1436
• Approx Pages: 6
• Has Bibliography