When Darwin was in the Galapagos islands, he noticed there were a variety of finches that existed on each of the islands. There were many different species of finch which differed in beak shape and overall size. This is adaptive radiation and natural selection at work. Remember the "sun" that Mrs. Stein drew? The adaptive radiation picture looks like a sun, because 1 species gave rise to many species.
-Eunice Chang
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