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The scrub-jay is a bird that never used to be seen north of California. In recent years, however, the bird has expanded its range north into the Puget Sound region in Washington state. At the same time, some new species of plants have been discovered in the same area. How can the gene flow of a plant species be connected to the gene flow of a migratory bird species?

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The birds could carry seeds of the new plants north with them
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