True. Competitive exclusion controls population size.
In a given area, two species that fight for the same finite resource (like food) cannot coexist. The species that has a modest survival edge over the others will supplant them. To put it another way, the other species will either become extinct or occupy a different niche.
The red squirrels displacing the grey squirrels in Britain is another instance of competitive exclusion in action. Due to diseases, competitive exclusion, and the elimination of hazelnuts, there were fewer red squirrels. Gray squirrels eventually displaced red squirrels because they swiftly adapted to their environment.
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