Which factor contributes most to selection A competition B variation c reproduction or de-recombination

Answer 1

The factor that contributes most is variation. Variation exists in populations due to genetic diversity, which is a result of mutations, genetic recombination, and genetic drift. This variation provides the raw material for natural selection to act upon, leading to differential reproductive success and ultimately driving evolution. Competition and reproduction are also important factors in evolution, but without variation, there would be no genetic diversity from which natural selection could result in the adaptation of populations to changing environments.