Which one of the following characteristics is most useful in identifying separate species? Closely related but separate species do not

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Interbreeding to produce viable offspring is one of the most commonly used characteristics in identifying separate species. If two groups of organisms cannot interbreed or produce viable offspring, they are considered to be separate species. This can be used even when two species appear very similar anatomically or require similar nutrients, as these traits alone do not necessarily indicate separate species. The geographic location is also not a reliable way to identify separate species, as closely related but distinct species can be found living in the same area.

Which One of the Following Characteristics Is Most Useful in Identifying