Identify the bacterium from the given options.

Who first realized the use of yeast in fermentation?

The nutritive medium for growing bacteria and many fungi in the laboratory is called

Consider the following statements:
$I.$ Antibiotics are chemical substances produced by some microorganisms which can kill or retard the growth of other disease-causing microorganisms.
$II.$ Penicillin is the first antibiotic discovered by Alexander Fleming $(1928)$,while working on the bacterium $Staphylococcus$ $aureus$.
$III.$ The function of penicillin as an antibiotic was established by Ernst Chain and Howard Florey.
Which of the statements given above are correct?

The term "antibiotic" was coined by

Which organisms have been used for human welfare for centuries?