By the statement, 'survival of the fittest' Darwin means that

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The strongest of all species survive

The most intelligent of the species survive

The cleverest of the species survives

The most adaptable of the species to change survives

answer is D.

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Detailed Solution

The life forms which are given with ideal varieties would survive, since they are the fittest to confront their environment, whereas the unfit are disposed of.
Herbert Spencer (1820-1903) who utilized the express 'the survival of the fittest' to begin with time. Whereas Darwin named it as normal determination.
Survival of the fittest, indicate that the organisms which are capable to fight every condition can nicely adapt its environment.
To adapt nicely in changing environment organisms, need to change its behaviors, some adaption leads to evolution of an organism.

Hence, the correct answer is option D.

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