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Geologists are rapidly becoming convinced that the mammals spread from their central Asian point of origin largely because of great variations in climate. - Ellsworth Huntington Geologists are rapidly becoming convinced that the mammals spread from their central Asian point of origin largely because of great variations in climate. - Ellsworth Huntington Geologists are rapidly becoming convinced that the mammals spread from their central Asian point of origin largely because of great variations in climate. - Ellsworth Huntington