What did Fa-Hien and Wanse discuss?

The oldest cultivated organism,yeast,was discovered by:

Which statement is correct regarding microbes and humanity?

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

Penicillium notatum stops the growth of

Identify the correct statements from the following:
$(A)$ Microbes have been used for centuries.
$(B)$ Not all microbes are pathogenic.
$(C)$ There are various methods to culture microbes in a nutrient medium.
$(D)$ Fungi,Cycas,viruses,and bacteria are examples of microbes.