"To accommodate for lack of dependable rainfall" would be the best option as to why the ancient Chinese organized large groups of people to build and maintain irrigation systems, since when rainfall would not come for long periods of time, the crops would likely die without proper irrigation.
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Why do you think flowing, organic shapes would be a key feature of an art form that is viewed as "secular"? Rococo was highly secular, emphasizing grace, charm, and gentle action, a lot of the artist liked how it looked when using the style.
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Absolute advantage is the ability of an individual to carry out a particular economic activity more efficiently than another individual group.
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Battle of Tippecanoe, lithograph by Kurz and Allison c. 1889. Defeat at Fallen Timbers and the subsequent treaties did not end American Indian resistance to U.S. expansion into the Ohio Valley. The U.S. victory broke Tecumseh's power and ended the threat of an Indian confederation.
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Answer:
Say you had Hydrochloric Acid. This is a very strong acid that can burn you. If you didn't know the pH that said it was an acid (1-7), then it could really hurt you.
Or if you had 3 cups either one of them had bleach, water, and a strong acid. You shouldn't pick one, becuase you could die. Bleach is a base, it has a pH of about 12. Water is neutral and has a pH of 7. But the strong acid could have a pH of 3.