Question

A population of birds is found on a remote island. Which of the following information is most important in deciding if the birds all belong to a single species or two separate species?
A) They share many physical characteristics.
B) They can breed with one another.
C) The males all sing very similar songs.
D) The offspring of some matings are sterile.
E) All the birds appear to eat the same range of food.

Answer

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