nationalism created ethnic tensions, resulting in civil war
<span>The subagent owes the same duties to the broker's client as the broker.</span><span>
</span>
The answer is A as river valley civilizations relied on rivers as a source of life. River valleys like Egypt, Mesopotamia and Xi, the rivers brought silt and made the soil very fertile, it also brought fresh water and fish to eat. People can also move fast using rivers.
