Gould and Eldridge said that if you look at the fossil record, you're going to see a long period of stasis where there's not a lot of change. In some cases, like in the Galapagos, it may just be a pregnant female or just one couple of birds or a pregnant tortoise who starts a whole new population. So, you can get kind of rapid evolutionary change. And certainly with reference to the way in which order develops in different islands or societies, whether we get equilibrium or we get some kind of functionality between species.

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