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That question is sort of unrelated to the passage however, but the passage was written poorly enough that I think you misunderstood that they were trying to say that 121 isotopes be extinct, but that some of them are not actually extinct.To reduce the confusion the passage is causing, I have rewritten it to be far more clear: "Among all the elements that have have ever occurred or currently occur on Earth there are 308 total isotopes.An example of this type of self-regenerating isotope is Carbon-14; in fact, Carbon-14 will likely never become extinct.Self-regeneration is not the only process to replenish isotopes; the aforementioned supernovas are another.When that ejecta reaches the Earth the isotopes within it begin to occur on Earth, but eventually those isotopes will disappear due to half-life degradation.There are processes which can replace degraded isotopes in a self-regenerating manner and thus those isotopes never go extinct due to self-regeneration.Although we know about 3300 isotopes in total, no doubt more very short lived isotopes were produced in the big bang or supernovas.I don't know how to determine which isotopes Dawkins thought to be the 150 stable ones, or the 158 unstable ones, nor which 121 of the unstable 158 that he determined were either extinct or exist only because they are constantly renewed.
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That is not nearly enough time for the isotope to travel from the exploded star to Earth, so that isotope does not occur on Earth (and it never can).So at this point it has been 5.54 billion years since the second generation supernovas which is 68.6 half-lives and only 2.3E-21 of the plutonium formed in the supernova would survive.
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