What are the odds that another organism mutates at around the same time/when the first one hasn’t died yet and that that mutation changes the second organism into the exact same species as the first one (changes the same dna bases) AND that those 2 organisms find each other and have sex?
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Species don’t change over the course of a single generation. It would take a population as a whole many years to get to a point where it couldn’t reproduce with the original members of the group, so this would not actually be a problem.
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