Question

in a population with brown and green alleles for color, genetic drift
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has more effect on the evolution of a small population.
always increases the frequency of brown alleles in the population.
causes populations to become better adapted to their environments.
has more effect on the evolution of a large population.
occurs when individuals move into or out of a population, changing the allele frequencies in the population.

Explanation:

Genetic drift is a mechanism of evolution that has a more significant impact on small populations. In small populations, random changes in allele frequencies (such as those due to chance events like a small number of individuals reproducing) can have a relatively large effect on the genetic makeup of the population. In large populations, these random changes are "diluted" and have less of an overall impact.

Answer:

has more effect on the evolution of a small population.