Answer:
Beak shape/size or song or behavior or mechanical/chemical differences or time of mating or location on the island or primary food source differs between the Big Bird lineage and G. fortis.
Also acceptable: Description of another mechanism that prevents males and females from different populations from encountering each other/recognizing each other as potential mates.
Hello,
The answer is for sure <span>A. O horizon</span>.Positive.
Hope this helps
I'm not sure but it might be C
