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Please give the names of scientist who discovered 1) yeast - which helps in fermentation,making of bread ect.

2) rhizobium - which helps in nitrogen fixing
3) penicillin - a very useful antibiotic
4 )decomposers are usually microbes
5) vaccines like that of polio are made by microbes



1.=Louis Pasteur 
Alexander Fleming
4.= bro i do not know about it so so sorry
Edward Jenner
mark as the best
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  yeast- which helps in fermentation,making bread etc.- Louis Pasteur 
 rhizobhium - which helps in nitrogen mixing -
 penicillum- a very useful antibiotic - Alexander Fleming
 decomposers are usually microbes- i don't know i have read all my bookks but no one discovered it
vaccines like polio are made by microbes - Edward Jenner

hope you like it and will help you too
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