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Bill Martin

Elio has a point with the rumen flora, but I'd take a slightly different slant. All the prokaryotes are dead, because the question said so. Next all of the prokaryote-eating protists die immediately for lack of food. That takes care of all the protist-eating protists, too. While that is going on, all of the vitamin B12-dependent eukaryotes die, because prokaryotes make all of the B12 there is. We and all of the other metazons are toast within a generation. That leaves more or less the fungi and the land plants, and (maybe) some algae left over to battle it out with the elements for a while. The impact would be rapid.

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