While on the Galápagos, Darwin observed variation among finches. These observations
A) helped lead Dárwin to move away from the concept of species as unchanging entities.
B) caused Darwin to assert that the ability of a population to expand is infinite.
C) confused Darwin, but he was later informed by the Grants, who were experts on birds, what he was seeing.
D) led to Darwin's formulation of the theory of natural selection, which he published while still in the Galápagos.
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