1.) Flax, wheat, and barley are what they grew.
2.) Lower Egypt.
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Marco Polo traveled during the middle ages (AP period 3), for this the communication technology was not very advanced and Western Europe didn't really know the situation of East Asia and vice versa. When Marco Polo explained his travels to the Europeans of the greatness of China many Europeans decided to go and see for themselves if this greatness was indeed true. When the Europeans arrived in China they were very impressed and a new promotion of travel to China emerged, INCREASING China's economy.
A unitary system of government is a monarchy. Which means that the country is ruled by one person or a group of people. An example of a unitary system is a country that is run by a royal family, that consists of kings and queens.
A federal system is a system is a system of government that is run but not ruled by a government that has many different political parties and many different people. The United States is an example of a federal system.
