Worst teacher ever, right? Okay, um. Well, we can do it in rats, for example. Say you have ten unrelated brown rats, and seemingly randomly, in the liters of those brown rats you get a kitten that's blue. It would seem like a spontaneous mutation, but for it to happen repeatedly across the species, in unrelated pairs, there would have to be something in the species' basic make up that made the blue mutation more likely. Does that help?
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Does that help?