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According to paragraph 4, which of the following is true of the geologic movements that brought about the Isthmus of Panama? A. The movement brought populations of certain fishes and marine organisms into contact with one another for the first time. B. The movement transferred populations of fishes and other marine animals between the Pacific and Atlantic Oceans. C. The movement created conditions that allowed water to flow more freely between the Pacific and Atlantic Oceans. D. The movement created conditions for the formation of new species of fished and other marine animals.