23. Speciation
Species
Multiple Choice
Multiple ChoiceBird guides once listed the myrtle warbler and Audubon's warbler as distinct species that lived side by side in parts of their ranges. However, recent books show them as eastern and western forms of a single species, the yellow-rumped warbler. Apparently, the myrtle warbler and Audubon's warbler __________.
A
live in the same areas
B
are almost identical in appearance
C
are merging to form a single species
D
have undergone coevolution
E
successfully interbreed and produce fertile offspring
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