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One reason for the development of an early civilization in the Tigris-Euphrates river valleys was that *

User Gorpacrate
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A. Periodic floods left rich soil, which was ideal for farming

User Buck
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One reason for the development of an early civilization in the Tigris-Euphrates river valleys was that the land in this area was especially fertile--meaning that crops were able to grow much more easily.
User Mackenir
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