Which type of front occurs when cold air and warm air are next to eachother, but are at a stand still? a. occluded front b. stationary front c. warm front d. cold front

The answer is; B

In such kind of a front, of the two air masses that have met, neither is strong enough to displace the other. Therefore, the front persists in the same area for an extended period of time. This is unlike cold and warm fronts  whose leading edges move in a particular direction while that of the occluded front spins cyclically.  

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.

the denominator has a very specific role.