Gause's principle of competitive exclusion is based on the idea that ____
a. larger organisms exclude smaller ones through competition as in the case of large trees controlling underbrush
b. competition for the same resources excludes species having different life styles.
c. no two species can occupy the same niche indefinitely when resources are limited
d. two species can coexist if their niches do not overlap
e. species survival depends upon coevoloution
ANSWER: c
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