I think the question is suppossed to be why you think eukaryotes evolve from archea as eukaryotes did not evolve into archea. And the reason should be that because archea show more similarity to eukaryotes than eubacteria.
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Boy, did you pick the wrong answer. Eukaryotes did not evolve from archaea either!!! Let's try it again: archaea and eukaryotes evolved from a COMMON ANCESTOR. And that split may have been precipitated by our ancestors acquiring mitochondria.
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As far as is understood, they didn't. Rather, archaea and eukaryotes share a common ancestor which branched off from prokaryotes.