During the last ice age, an advancing ice sheet cut through the range of ancestral brown bears in North America.Isolated in different environments, these ancestors eventually evolved into the modern brown, grizzly, and polar bear species.Thus, their evolution resulted from the process called _______.

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The Answer of During the last ice age, an advancing ice sheet cut through the range of ancestral brown bears in North America.Isolated in different environments, these ancestors eventually evolved into the modern brown, grizzly, and polar bear species.Thus, their evolution resulted from the process called _______.

During the Last Ice Age, an Advancing Ice Sheet Cut