Where in earth is a diamond formed? what event must occur in order for a diamond to reach earth's surface?

Diamonds are formed deep within the earth about 100 miles or so below the surface in the upper mantle. The combination of high  pressure and high  temperature is what causes  diamonds to form.

Diamonds that appear at the surface of the earth were brought up by very deep -seated volcanic eruption. It is a very rare and unique kind of volcanic eruption that is very violent. These eruptions occurred long ago carrying the already formed diamonds from the upper mantle to the surface of the earth.

On reaching the surface of the earth, it built up a mound of volcanic matter that eventually cooled, and the diamonds were contained within the cooled mound. These mounds are called Kimberlites and are typically the source of many of the world's mined diamonds.

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.

i am positive it is c. condensing but i may be wrong