Yeast has many commercial uses in the production of

breads
fuels
sodas
wine

Breads, Fuels and wine

Explanation:

Yeasts are basically fungi. They are eukaryotic single-celled organisms and are classified as members of fungus kingdom. It is one the leavening agents in baking. There are many species of yeast. Saccharomyces cerevisiae, is the most common yeast known in the brewing and baking industry. It is a part of healthy mix of bacteria in our gut and can help in absorbing minerals and vitamins from the food. It can even fight disease.

the answer will be a) proteins i believe

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.