Han emperors were so successful at maintaining power because the silk road established steady trade.
Explanation:
The Han dynasty ruled from 206 BCE to 220 BCE. During this period the dynasty achieved many things. There was development in the government structure as well as there was development in civil service. Scientific advancement took place such as development of seismograph, invention of paper was made, water clock uses came into the scene.
Silk road played a huge role because goods were traded through this road. Gun powder was also a Chinese invention.The rich spices also contributed in the silk industry.
Cellular respiration uses oxygen in the chemical reaction that releases energy from food. Fermentation occurs in an anaerobic or oxygen-depleted environment. Because fermentation doesn't use oxygen, the sugar molecule doesn't break down completely and so releases less energy.
