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A. Random changes occur in the genes or chromosomes of an orgnism.
B. Organisms move from one location to another without returning.
C. Organisms are separated from members of their species by rivers or mountains.
D. A species changes to fill many niches in an area.

A. decreased competition between two species leads to increased niche specialization. B. character displacmement is evidence of competition and resource partitioning. C. no tw species can occupy the same ecological niche at the same time. D. adjacent ecological niches lead to the elimination of one of the niches.