Answer:
China´s first unification occurred in 221 BCE. The king of Qin, Shi Huang Di, conquered all the other states of his time, often involved in endless wars (that´s why the era before unification was called the Warring States Period), and imposed his rule over the whole of those territories. He was the founder of the Qin dynasty, the first Chinese imperial dynasty.
Explanation:
The development of large farms has polluted the river through waste runoff.
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There are 195 countries in the world.
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Answer:
Ocean currents act as conveyer belts of warm and cold water, sending heat toward the polar regions and helping tropical areas cool off, thus influencing both weather and climate.