Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species. Recently, these birds have been classified

Question

Bird guides once listed the myrtle warbler and Audubon's warbler as distinct species.
Recently, these birds have been classified as eastern and western forms of a single
species, the yellow-rumped warbler. Which of the following pieces of evidence, if
true, would be cause for this reclassification?
The two forms interbreed often in nature, and their offspring have good survival
and reproduction.
The two forms have many genes in common.
The two forms are very similar in coloration.
The two forms live in similar habitats.
The two forms have similar food requirements

Kunduz · Accepted Answer

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