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(B) Charles Darwin's theory of evolution,as presented in his work 'On the Origin of Species',is fundamentally based on the principle of $Natural \ sel

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Natural selection

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(B) Charles Darwin's theory of evolution,as presented in his work 'On the Origin of Species',is fundamentally based on the principle of $Natural \ selection$. While 'Survival of the fittest' is a phrase often associated with his theory (coined by Herbert Spencer),and 'Descent with modification' describes the pattern of evolution,the core mechanism that explains how evolution occurs is $Natural \ selection$. Mutation was not part of Darwin's original theory,as the mechanism of inheritance and genetic variation was unknown at that time.

Darwin's theory of evolution was primarily based on which of the following concepts?

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