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When we say ' survival of the fittest ' ...

When we say ' survival of the fittest ' , does it mean that
(a) those which are fit only survive
(b) those that survive are called fit? Comment.

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In the struggle for existence, the individuals which have more favourable variations will enjoy a competitive advantage over others which have less favourable or unfavourable variation.
They are considered fit and thus, will survive and reproduce. Such individuals produce more progeny ( with more fit individuals ) than others who are less adapted in that environment
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