The term "normal" refers to the of values from a population.

The correct answer to this open question is the following.

The term "normal" refers to the average of values from a population.

This term is used to identify the average or normal behavior patterns of the members of a society in determined circumstances. This facilitates researches, historians, and mathematicians to predict what could be the response of people under determined circumstances by analyzing what has happened in the past.  

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.