Bird Guides Once Listed the Myrtle Warbler and Audubon's Warbler

question 9

Multiple Choice

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?

• A)The two forms interbreed often in nature, and their offspring have good survival and reproduction.
• B)The two forms live in similar habitats.
• C)The two forms have many genes in common.
• D)The two forms have similar food requirements.
• E)The two forms are very similar in colouration.

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