An observer measured the air temperature and the dew point and found the difference between them to be 12°C. One hour later, the difference between the air temperature and the dew point
was found to be 4°C. Which statement best describes the changes that were occurring?
(1) The relative humidity was decreasing, and the chance of precipitation was decreasing.
(2) The relative humidity was decreasing, and the chance of precipitation was increasing.
(3) The relative humidity was increasing, and the chance of precipitation was decreasing.
(4) The relative humidity was increasing, and the chance of precipitation was increasing.

The relative humidity was increasing, and the chance of precipitation was increasing.

Explanation:

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.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .