Two species of buttercup are found in the same field in South Dakota, but they emerge at different times: One species emerges and flowers in early spring, and the other species does not emerge until late summer, after the first species has set seed. This is an example of

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This is an example of resource partitioning, where two species coexist by utilizing different resources or engaging in different activities to reduce competition, in this case, by emerging and flowering at different times.

Two Species of Buttercup Are Found in the Same Field