Mention a product of human welfare obtained with the help of each of the following:
(a) Saccharomyces cerevisiae
(b) Propionibacterium shermanni
(c) Aspergillus niger
(d) Trichoderma polysporum
(e) Acetobacter aceti
(f) Streptococcus
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Microorganisms like Saccharomyces cerevisiae, Propionibacterium shermanni, and others are essential in various industrial processes like fermentation, biocontrol, and food production.