What is a bacteria and how does it form????

Dear Student,
Bacteria
: 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. 

Bacteria are living organisms. So they always come from pre-existing living bacteria. One Bacterial cell reproduces asexually generally by splitting up into two daughter bacterial cells.

Hope this information will clear your doubt.
Regards,

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