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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?
Age
A measure of time, typically used to indicate how long an individual or entity has existed, often expressed in years.
Reading
The process of interpreting written symbols and comprehending written or printed material.
Relationship Between Variables
The way in which two or more variables interact with each other, indicating a correlation or causal connection.
Nature
The inherent qualities or characteristics of something or the physical world collectively.
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