Question

what is bacteria ..is Bacteria is used for human???

Answer 1

bacteria are single celled prokaryotic organism Bacteria is also found in human .

Answer 2

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. 

---------------------------
One useful bacteria: Heterotrophic bacteria 
---------------------------

1️⃣There are various uses of heterotrophic bacteria like in making curd, antibiotics vaccines against pathogenic bacteria.