Which of the following microbes is the source of the first antibiotic?

Which of the following organisms are considered microbes?

Most of the antibiotics are derived from which of the following?

Identify the correct statements with respect to antibiotics:
$(i)$ Fleming,Chain,and Florey were awarded the Nobel Prize in $1945$.
$(ii)$ Antibiotics have greatly improved our capacity to treat deadly diseases.
$(iii)$ Penicillin was used to treat American soldiers wounded in World War $I$.

$A$: Microbes have been used for the welfare of humanity.
$R$: The fields of biotechnology and genetic engineering have developed.

$A$ process that uses micro-organisms to convert harmful industrial wastes into less toxic or non-toxic compounds is known as: