A small number of birds arrive on an island from a neighboring larger island. This small population begins to adapt to the new food plants available on the island, and their beaks begin to change
About twice a year, one or two more birds from the neighboring island arrive. These new arrivals _____.
A) speed up the process of speciation
B) tend to promote adaptation to the new food plants
C) tend to retard adaptation to the new food plants
D) represent a colonizing event
Answer: C
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