Is the formation of alcohol from sugar.
a. lactic acid fermentation
b. glycolysis
c. yeast
d. alcoholic fermentation

d. Alcoholic fermentation

Explanation:

The alcohol fermentation is a process in which the sugars like fructose, sucrose and glucose are transformed into alcohol and carbon dioxide by the activity of microorganisms or fungi. It is a biological process. This process takes place in the absence of oxygen. In the absence of oxygen this process is called as anaerobic process. The alcohol produced after this process is used for making beverages, bread and fuel.

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.