URGENT!!!!!!!!
Bird 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 ____

Select one:

are merging to form a single species

are almost identical in appearance

successfully interbreed and produce fertile offspring

live in different places