The climatic cooling of the last 55 million years has been caused by ________.
A. the ongoing breakup of Pangaea into separate continents
B. the uplifts of the Tibetan Plateau/Himalaya Mountains in Asia and the Colorado Plateau in the western United States deflecting west-to-east atmospheric circulation in the midlatitudes
C. continental masses moving into polar latitudes
D. snow and ice accumulating on polar landmasses, increasing albedo
E. All of these choices are correct.
Answer: E
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