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

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 is a key factor in determining whether two populations are separate species, as the ability to interbreed and produce fertile offspring indicates that they are genetically similar enough to be considered the same species, despite differences in appearance.