The duffy antigen is found in most individuals from western africa. it provides some resistance to malaria. which of these processes would explain why this trait can now be found in many of the white, european populations?
a) gene flow
b) genetic drift
c) natural selection
d) allele reorganization
which physical factors most influence the antarctic ecosystem?
a) climate, rain, erosion
b) plants, wind, and air pressure
c) weather, ice, and ocean currents
d) salinity of water, polar bear population, and snow
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