Why do harmful mutations often remain present in the gene pool instead of being completely removed?

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Because they are recessive and exist in individuals who are heterozygous carriersDue to genetic drift affecting offspring in small populationsBecause they enable reproduction across diverse environmental conditionsSince they provide survival advantages in the future

Explanation

Harmful mutations persist in the gene pool primarily because they are recessive and hidden in heterozygous carriers, preventing natural selection from eliminating them completely.