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

question 21

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.What effect do these new arrivals have?

• A)Their arrival speeds the process of speciation.
• B)Their arrival tends to promote adaptation to the new food plants.
• C)Their arrival tends to retard adaptation to the new food plants.
• D)Their arrival represents a colonizing event.

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