On the Galapagos Islands, several species of birds have been identified. Researchers Peter and Rosemary Grant studied these bird species for about 40 years. During this time they found that drought led to more more birds with larger beaks. During wet years, the beak sizes shifted so that there were more birds with smaller beaks. This represents ...(1 point)
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a change in gene frequency.
a change in gene frequency.
speciation.
speciation.
mutations that have occurred in as a result of the wet and dry climates.
mutations that have occurred in as a result of the wet and dry climates.
gene flow.