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Looking into the history of bio-evolution on earth, we can see that some primordial lives evolve slowly without changes for millions of years and still exist today, such as gingkgo, coelacanth, limulus, which are called living fossils. So it can be inferred that the earlier a primordial life appears and the slower it evolves, the longer it can exist. Given that, on average, a creature accumulates 0.5—1000 dead genes per million years. When dead genes accumulate to more than 3000, its extinction probability may exceed 0.75. When accumulating to more than 5000, that is 0.95. Accordingly, how about the human being? ( Homosapiens appeared about 20-30 thousand years ago and that is rather late.) When will they extinct? Please build a math model to discuss.