Charles Darwin quote about evolution from On The Origin of Species - It seems clear that organic beings must be exposed during several generations to new conditions to cause any great amount of variation; and that, when the organisation has once begun to vary, it generally continues varying for many generations.
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It seems clear that organic beings must be exposed during several generations to new conditions to cause any great amount of variation; and that, when the organisation has once begun to vary, it generally continues varying for many generations.
 Charles Darwin, On The Origin of Species (1859). copy citation

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