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In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea?

Archaea have some novel features that are absent in other prokaryotes and eukaryotes
Archaea resemble eukarya in all respects
Archaea completely differ from prokaryotes
Archaea completely differ from both prokaryotes and eukaryotes
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