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Which statement about the beak size of finches on the island of Daphne Major during prolonged drought is true?a) each bird evolved a deeper, stronger beak as the drought persistedb) each bird's survival was strongly influenced by the depth and strength of its beak as the drought persistedc) each bird that survived the drought produced only offspring with deeper, stronger beaks than seen in the previous generationd) the frequency of the strong-beak alleles increased in each bird as the drought persisted
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