what microorganisms have been used to make marmite? what microorganisms have been used to make bun? what microorganisms have been used to make cheese? what microorganisms have been used to make beer? what microorganisms have been used to make vinegar? what microorganisms have been used to make malt vinegar?

Explanation:

It is produced industrially by fermentation using yeast or bacteria. Marmite's defining ingredient is made from brewer's yeast heated to create glutamic acid, which is used by farmers to increase plant growth and boost crop yields.

it is very expensive

explanation:

the answer for this question would be d. glaciers