Two similar groups of birds live in the same geographical area. Which of these observations would provide the best evidence that these two groups belong to different species?

A. Members of the two groups do not mate with each other.
B. Members of the two groups mate occasionally, producing fertile offspring.
C. Members of one group appear slightly larger than members of the other group.
D. Members of one group have slightly redder tail feathers than members of the other group.



Answer :

Final answer:

The best evidence that two groups of birds belong to different species is when members of the two groups do not mate with each other.


Explanation:

The best evidence that two groups of birds belong to different species would be if members of the two groups do not mate with each other. When different species do not interbreed, it indicates that they have evolved in isolation and have reproductive barriers that prevent gene flow. This lack of interbreeding maintains the genetic distinction between the species.


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