Difference between bacteria, archaea and eukaryota ??

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Dear Student

Bacteria are microscopic unicellular micro-organisms having circular DNA in a region called nucleoid as well as few organelles of which none are surrounded by an envelope. They are prokaryotes. Only some bacteria cause diseases while others are useful in  nature. 

Archaea are single-celled microorganisms with structure similar to bacteria. They are evolutionarily distinct from bacteria and eukaryotes and form the third domain of life. They are obligate anaerobes living in environments low in oxygen.

Eukaryota has organisms whose cells have a nucleus enclosed within membranes. This is unlike prokaryotes, bacteria and archaea. They have no membrane-bound organelles. 

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