Answer:
Darwin's theory of natural selection states the struggle for existence, i.e. the individual which has more favourable variations will enjoy a competitive advantage over the ones which have less favourable or unfavourable variations. In other words, only those organisms which are well - adapted to their environment are fit to survive in the struggle for existence. The key factor in determining survival is adaptation to the environment. Any variation, be it physical, physiological or the behavioural one, which gives an individual a survival advantage over another, will act as a selective advantage in the struggle for existence. In this way, natural selection leads to increased vigour within the species. This sorting out of the individuals with useful variations was called as natural selection by Darwin.
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