According to Darwin’s findings, he proposed that the finches he observed in the Galapagos islands differed due to which of the following?

The finches though similar enough to be categorized as finches, did differ in their color patterns, head size/shape and beak size/shape. Darwin proposed that this change was due to the finches adapting to their natural habitat. The climate on each of the Galapagos islands differed and as a result the vegetation and habitat differed among the islands. According to Darwin's theory of natural selection, organisms adapt to their environment and this adapting process will influence the physical appearance of an organism.[Life Science]