Darwin judged the fitness of an individual by

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(C) According to Darwin,fitness is ultimately defined by reproductive success. Darwin realized that in a population facing intense competition,variati

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Number of offsprings

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(C) According to Darwin,fitness is ultimately defined by reproductive success. Darwin realized that in a population facing intense competition,variations that favor survival in a specific environment increase an individual's ability to reproduce and leave fertile offspring. Individuals with favorable variations are more likely to survive and pass their traits to the next generation. Therefore,the 'survival of the fittest' is essentially the selection and proliferation of organisms that are most suitably adapted to their environment,measured by their contribution to the gene pool of the next generation,i.e.,the number of offspring produced.

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