<span>The French Revolution of 1789, while based on the ever-growing popular Enlightenment ideals put forth by philosophers such as Descartes, Voltaire, and Diderot, ultimately failed because the change in regime created a severe power vacuum. This allowed radicals to seize power and sow chaos within France
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The condition of scare rainfall for a few years is known as a drought (I think)
B) is the correct answer for this question
They helped move stuff around to trade and they needed little food and water to survive.