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But I can find out no such case.Ī lot has changed since 1859.

Initially, Darwin believed that natural selection was the only process that led to evolution, and he made this explicit in On the Origin of Species: If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. It takes place gradually through random variations, or ‘mutations’ as we call them today, which accumulate over decades, centuries, or millions of years. Over longer periods of time, Darwin postulated, an accumulation of advantageous variations might produce more significant novel adaptations – or even the emergence of an entirely new species. In the short term, a small variation might confer a slight advantage to an organism and its offspring, such as a longer beak or better camouflage, allowing it to outcompete similar organisms lacking that variation. As Darwin understood it, natural selection is a slow and gradual process that takes place across multiple generations through successive random hereditary variations. Since 1859, when Charles Darwin’s On the Origin of Species was first published, the theory of natural selection has dominated our conceptions of evolution.

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