merits and demerits of natural selection theory
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The main drawback in Darwin's theory is that he assumed that the organisms are having favourable and unfavourable variations. The main aspect in the mechanism of evolution is the origin of variations. ... Natural selection according to Darwin is only an arbiter to decide which variation is favourable or unfavourable.
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The main aspects of the theory of natural selection are as follows.
1. Rapid multiplication.
2. Limited food and space causing straggle for existence.
3. Natural selection or survival of the fit and elimination of the unfit.
4. Origin of new species.
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