A large flock of endemic birds is discovered on a remote island. There appears to be two similar but different kinds of birds within the flock. Which of the following information is most important in deciding whether the two kinds of birds belong to a single species?
a) whether both kinds of males sing similar songs
b) whether both kinds of birds eat the same range of food
c) whether the matings between kinds produce viable offspring
d) whether both kinds mate with one another
e) whether both kinds share many physical characteristics
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A large flock of endemic birds is discovered on a remote island. There appears to be two similar but...
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