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36.A population of bison was separated by the construction of a new interstate. The construction also separates bison east of the interstate from its natural predator, and bison west of the river from the primary source of water. Much time passes.
The horns of bison east of the interstate become less sharp than those west of the interstate. This is an example of:
38.A female bison and male bison from different populations are brought together by researchers for breeding. The resulting offspring are all sterile. This is most likely because the bison no longer share the same: