Answer: About the same time they domesticated plants, people in Mesopotamia began to tame animals for meat, milk, and hides. Later, people began domesticating larger animals, such as oxen or horses, for plowing and transportation. These are known as beasts of burden. Domesticating animals can be difficult work.
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The economy is 3.4 trillion
The Mali Empire collapsed in the 1460s CE following civil wars, the opening up of trade routes elsewhere, and the rise of the neighbouring Songhai Empire, but it did continue to control a small part of the western empire into the 17th century
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The Bosporus strait is the waterway that Istanbul controls. It connects the Caspian and Black seas.