If energy efficiency is improved, the cost of energy would decrease and a)more coal would be available
b) less electricity would be used
c) homes would cost significantly less
d) energy star appliances would no longer be necessary

The correct answer is option B

The energy efficiency can be defined as the output of energy to the input of energy.

As the efficiency of energy is increasing then the consumption of electricity will be less because previously the energy was used more due to loss of energy.

But now the energy will not be lost in the form of heat or friction and the cost of energy will be less.

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.