and island and some have big beaks and some have small beaks.. Let’s say for some environmental reason, all of the small seeds on the island disappear and there are only large seeds left, so the birds with small beaks are unable to eat and most of them die. Now there are only a few small birds left to mate and make small bird babies, so in the next bird generation, there are more big birds than small ones. After several generations of this sort of thing, there will only be big birds left, and the bird…
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