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Answer:
Best evidence would be to interbreed these species with each other. If they can reproduce we can conclude that they have not diverged, however, if they cannot reproduce they have diverged. We can say this due to the biological species concept.
The biological species concept defines a species as members of populations that actually or potentially interbreed in nature, not according to similarity of appearance. Although appearance is helpful in identifying species, it does not define species according to biological species concept.
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