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Based on the data shown in the graph, which of the following is the most plausible hypothesis about the number of glacial periods that occurred in the past 400,000 years?AOne glacial period occurred in the past 400,000 years.BTwo glacial periods occurred in the past 400,000 years.CThree glacial periods occurred in the past 400,000 years.DFour glacial periods occurred in the past 400,000 years.

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