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Nile perch were introduced to lakes containing native populations of cichlids. The Nile perch are predators of cichlids and the two species coexist in lakes where perch were introduced. A biologist studying the lakes observed the cichlid populations in the lakes containing Nile perch and nearby lakes that did not have Nile perch. The biologist collects the following data. Answer the next two questions based on this dataset.Lake Average caudal fin length With Nile perch 4.5 cm Without Nile perch 3.3 cm

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