Question

the evolution of populations due to chance is
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genetic drift.
has more effect in large populations than in small populations.
natural selection.
gene flow.
genetic variation.

Explanation:

Genetic drift is a mechanism of evolution where allele frequencies in a population change due to random chance. It has a more significant effect in small populations because chance events can more drastically alter the gene pool. In large populations, the impact of random changes is diluted. For example, if a small population has a few individuals with a particular allele, and by chance, those individuals don't reproduce, that allele can be lost. In a large population, the same chance event (e.g., a few individuals not reproducing) has less impact on the overall allele frequencies.

Answer:

genetic drift.