The Reign of Terror came to an end, because the man who had started the Reign of Terror (Robespierre) was executed. The Reign of Terror also came to an end, because nuns had been executed because they did not want to give up their monastic vows and they were very calm during the execution, so this shifted the mood in Paris, probably making the general population realize that the mass executions were futile.
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Answer: Pessimistic novelists
Scientists can determine if oxygen existed in Earth’s Archean atmosphere by looking for oxidized iron in rock. In the beginning, there was only a little to no oxygen in the atmosphere. The oxygen that are being produced by cyanobacteria is only enough for the weathering process. There will only enough oxygen that shall remain in the atmosphere when the rocks at the surface are properly and adequately oxidized. However, as time goes by, evidences said that the amount of oxygen in the Archean atmosphere is actually increasing in a slow steady pace.
