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How are bacteria and archaea similar?

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Archaea, bacteria, and eukarya form three distinct branches of the Tree of Life or the phylogenetic tree, which traces the evolutionary history of organisms and indicates common ancestors. Archaea used to be thought of as bacteria, though this is an erroneous classification. read more

Both bacteria and archaea are organisms consisting of a single cell that lacks a nucleus or organelles. Even though these two groups are evolutionarily unique, there are a number of similarities. It is easy to see why archaea were once considered a type of bacteria. read more

The general cell structure of archaea and bacteria are the same but composition and organization of some structures differ in archaea. Similar to bacteria, archaea do not have interior membranes but both have a cell wall and use flagella to swim. read more

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I am confused about the wording of bacteria as a domain ...
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