Which observation would be evidence for allopatric speciation among finch species of the Galápagos Islands?
A. The birds are closely related to birds found on the mainland.
B. No pairs of sister species formed on the same island.
C. Pairs of sister species can be found on adjacent islands.
D. Specific beak sizes are adaptations to the seeds of different species.
E. Many different species have been found on the islands.
Ans: B. No pairs of sister species formed on the same island.
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