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Im pretty sure that within a few hundred million years, humans will begin evolving 'backward' into apes, reptiles, birds, etc. They will in turn regress into simpler, less complex organisms. Eventually, all that will be left on earth are the simple prokaryotes and eukaryotes. Finally, another pre-Cambrian type disaster will strike, leaving only one fortunate single celled organism on the earth. Then the process will repeat infinitely, even though the universe is not eternal.

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I'd be willing to bet against this and lay 2:1.