What was the most revolutionary aspect of Darwin's theory as published in his 1859 The Origin of Species?

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The most revolutionary aspect of Darwin's theory was the notion of natural selection as the mechanism for evolution. While the idea of the evolution of species was not a new one, Darwin's proposal that natural selection acted on random variations within a population to favor those individuals best adapted to their environment was a major departure from previous theories of evolution. This concept revolutionized our understanding of how species evolve over time and has since become a cornerstone of modern biology.

What Was the Most Revolutionary Aspect of Darwin's Theory as Published