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(A) Darwin's theory of natural selection is primarily based on the concepts of 'Struggle for existence','Survival of the fittest',and 'Variations'. Da

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Discontinuous variations

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(A) Darwin's theory of natural selection is primarily based on the concepts of 'Struggle for existence','Survival of the fittest',and 'Variations'. Darwin believed that variations are small,directional,and continuous. He did not consider 'Discontinuous variations' (mutations) as a part of his theory,as the concept of mutation was later introduced by Hugo de Vries.

Which of the following was $NOT$ considered a part of Darwin's theory of natural selection in organic evolution?

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