The finches that Darwin observed had:
A) Beaks that differed by island.
On the different islands that Darwin visited, he noticed that the finches had varying beak shapes and sizes. This variation in beaks was related to the type of food available on each island. For example, finches with larger, stronger beaks were better suited for cracking tough seeds, while finches with smaller, more delicate beaks were adept at feeding on insects or fruits. This observation played a crucial role in Darwin's theory of evolution by natural selection, as it showcased how environmental factors could drive changes in species over time.
