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Changes in climate have altered Earth's coastlines and their environments. A. Changing coastlines affect the total amount of land available for people to live on. B. The existence of Beringia, a vast landmass that may have supported human life, is still debated by archaeologists. C. Raised beaches, which may contain indicators of human activity, are often the result of isotactic uplifts and tectonic movements. D. The expansion and contraction of glaciers caused rises and falls in sea levels all over the world and in some areas, led to radical changes in their flora and fauna. E. The climate changes that led to alternations in the coastlines of San Francisco, Scandinavia, Scotland, Alaska, and Newfoundland isolated species that had once flourished together. F. Because raised beaches along the Mediterranean Sea were caused by tectonic movements, they contain abundant evidence of ancient civilizations.