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Answer: War
Explanation: War was one factor in the decline of Rome.
Answer: 1346
The Black Death was the deadliest pandemic recorded in human history. The Black Death pandemic resulted in the deaths of up to 75–200 million people in Eurasia and North Africa, peaking in Europe from 1347 to 1351. Plague, the disease, was caused by the bacterium Yersinia pestis.
Answer: Plasma is a main component of blood, which also consists of mostly water