Refer to the Figure

Refer to the figure.

-You are studying a remote island before and after a volcanic eruption. Data at Time 1 were collected one month before the eruption, and data at Time 2 were collected one month after the eruption. All of the species on the island are endemic. The island is 100 km across. Each animal icon represents 20 individuals. Species A and B (the two snail species) generally move a distance of only 2 m a day. Species C (the bird) often covers 20 km a day in search of food. After the eruption, the lava flow hardens, and the island is divided by a 20-km strip of bare rock with few, if any, resources these animals need to survive. Would you expect to see a change in patterns of gene flow in species B and C? Why or why not?

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A change in gene flow would be expected ...

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