What do aerobic respiration and lactic acid fermentation have IN COMMON?

While aerobic respiration and fermentation both produce energy, the products of the processes are in different forms. The products of aerobic respiration are carbon dioxide, water, and energy in the form of ATP. The products of lactic acid fermentation are lactic acid and NAD+

Explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

the answer is c. it will give up it's valence electron to the other atom.