When studying birds in the Galapagos Island, Darwin saw that a few bird varieties with similar beak size and shape lived in a particular area. The limited number of similar varieties was most likely due to

Interspecies hybridization

Explanation:

Differences in beak shapes tell us that all the finches eat the same type of food. Different finch beak shapes are evidence that all Galapagos finches shared a common ancestor a long time ago. Different finch beak shapes are evidence that over time, finch species adapted to different food sources on the islands.

Changes in the size and form of the beak have enabled different species to utilize different food resources such us insects, seeds, nectar from cactus flowers as well as blood from iguanas.

Interspecies hybridization

Explanation:

Darwin's observation of the limited number of similar bird varieties was due to interspecies hybridization .

The phenomenon called hybridization occurs through genetic crossing involving two animals of different species, in the case of the question above, two birds of different species. The result of this hybridization is that the offspring generated from this crossing, in most cases, do not have organisms with the ability to reproduce. This is because the countries of this offspring, being of different species, have incompatible genes, making the offspring sterile, in most cases, but there are exceptions.

This phenomenon causes the emergence of new species, which will end up always having a small population, due to the inability to reproduce. Thus generating a limited number of similar varieties within the species.

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