The decline of the popularity of the Silk Road __________. A. led to the end of the Mongol Empire B. encouraged exploration and
the discovery of new trade routes C. meant economic ruin for Chinese society, from which they have been unable to recover D. resulted in a decline in the power of the Islamic empire
According to the circadian rhythm, i.e the biological clock which is maintained by exposure to the light. As in winter, especially in northern latitudes, the daylight hours are limited and short thus the light can be scarce as compared to the summers.
