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Although there are genetic trends that persist (e.g. average height increase), modern humans will not benefit greatly from Darwin's "survival of the fittest" because humans with various genetic deficiencies (poor eyesight, hemophilia, disposition to various diseases) are no longer at as great a disadvantage in competition within human society.

Modern medicine, which has conversely extended the average human lifespan, enables many individuals to survive and procreate who might otherwise have reproduced at a much lower rate than those without these deficiencies. This was a major driving force behind many movements that championed "eugenics" (improvement in the gene pool) and other plans to increase the percentage of genetically-advantaged groups in the overall population.

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