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Answer :
C but it could be A, sorry if this didn’t help
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Final answer:
Differences in finch beak structure observed by Darwin in the Galápagos Islands were primarily due to genetic variations that adapted to different environments, exemplifying natural selection and adaptive radiation. Option A
Explanation:
Darwin's studies of finches on the Galápagos Islands suggest that the differences in beak structure between the different species were most directly due to genetic variations for beak shape that became adaptations to different environments. This process is a classic example of natural selection, where the beak shapes of the finches evolved to better suit the specific food sources available on their respective islands. For example, finches with larger and stronger beaks were able to crack open large seeds on some islands, while others with smaller beaks were better suited for small seeds on different islands. This specialization allowed the finches to effectively utilize the available resources and contributed to the formation of distinct species through adaptive radiation. A famous long-term study by Peter and Rosemary Grant provided important evidence for these adaptations, showing how beak sizes could change between generations in response to environmental pressures such as food availability.
