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Big-beaked finches that prefer to mate with other big-beaked finches are __________ isolated from small-beaked finches living on the same island.

A. Partially
B. Completely
C. Occasionally
D. Rarely

Answer :

Final answer:

Big-beaked finches are completely isolated from small-beaked finches due to differences in traits and preferences in mating, which leads to reproductive barriers, even while living in the same habitat.

Explanation:

Big-beaked finches that prefer to meet with other big-beaked finches are b) Completely isolated from small-beaked finches living on the same island. This is a classic example of speciation, where over time, due to differences in traits, specifically their beak sizes in this case, and behavioral isolation, two groups from the same ancestors become unable to interbreed. This isolation can be attributed to the preferences in mating partners within the respective groups. The larger beaked finches may prefer to mate with those similar to them, creating a reproductive barrier and therefore completely isolating them from the small-beaked finches, even if they live in the same environment or habitat.

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