Wednesday 3. Scientists believe that the polar bear in Alaska and the brown bear in Russia
evolved from a common ancestor. Which would be responsible for this evolutionary
change?
A. artificial selection
B. asexual reproduction
C. sexual competition
D. geographic isolation

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls