Final answer:
Average heterozygosity decreases at a faster rate in small populations than in larger populations over the same time span.
Step-by-step explanation:
Genetic drift is a random process that can lead to changes in allele frequencies over time. Average heterozygosity decreases at a faster rate in small populations than in larger populations over the same time span. This is because genetic drift has a greater impact on smaller populations, where chance events can have a larger effect on the overall genetic makeup. In larger populations, the effects of genetic drift are buffered by the presence of a diverse gene pool, making it less likely for changes to occur.