The abo and mn blood-type frequencies of the dunkers differ significantly from those of current american and german populations due to: a) gene flow. b) mutation. c) natural selection. d) genetic drift.

d) genetic drift

Explanation:

The ABO and MN blood-type frequencies of the Dunkers differ significantly from those of current American and German populations due to Genetic Drift. This term refers to variation in the relative frequency of the different genotypes that may exist within a small population, which results in the extinction of different genes as individuals die without reproducing.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.