Question

Until recently, the myrtle warbler and the Audubon's warbler were thought to be separate species of birds because the males have very different appearances. Which of the following observations most likely led to the reclassification of these warblers as one species?(1 point)
Responses

The myrtle warbler and the Audubon's warbler have the same diet.
The myrtle warbler and the Audubon's warbler have the same diet.

The myrtle warbler and the Audubon's warbler lay the same number of eggs.
The myrtle warbler and the Audubon's warbler lay the same number of eggs.

The myrtle warbler and the Audubon's warbler have overlapping geographical ranges.
The myrtle warbler and the Audubon's warbler have overlapping geographical ranges.

The myrtle warbler and the Audubon's warbler interbreed and produce fertile offspring
The myrtle warbler and the Audubon's warbler interbreed and produce fertile offspring
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Answer 1

The observation that most likely led to the reclassification of the myrtle warbler and the Audubon's warbler as one species is:

**The myrtle warbler and the Audubon's warbler interbreed and produce fertile offspring.**

This observation suggests that despite their physical differences, the two birds are genetically compatible, which is a key factor in determining whether two populations belong to the same species.