Select three of the components that were proposed by Darwin for natural selection to occur. Check All That Apply Populations experience differential reproductive success. Populations experience differential reproductive success. Breeding is done intentionally with the intent to increase the frequency of desired traits. Breeding is done intentionally with the intent to increase the frequency of desired traits. Variation within a population is heritable. Variation within a population is heritable. Populations experience competition for resources. Populations experience competition for resources. The variations in a population make no difference in terms of reproductive success. The variations in a population make no difference in terms of reproductive success.