A Small Number of Birds Arrive on an Island from a Neighboring

question 55

Multiple Choice

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. Which of the following effects is most likely to result from the immigration?

• A) an increase in the speed of speciation
• B) an increase in birds' adaptation to the new food plants
• C) a decrease in birds' adaptation to the new food plants
• D) another round of incipient speciation

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