Answer:
Explanation: The answer is D.
Answer:
Both are very important for trade.
Explanation:
Seas and oceans are very important for maritime trade because trading through seas and oceans are less costly for the countries. There are big ships which can be used for trade purpose between different countries. For trading by sea and ocean, countries built sea ports. The sea and ocean is fragile means easily be damaged. There is a great damage occur to the sea and ocean due to climate change and global warming that disturb the ecosystem and trading routes.
The Tang rulers established a system of coinage. This was an accomplishment by the Tang Dynasty of China.
The system of coinage began in Tang dynasty and continued its existence in the succeeding dynasties.
Kai Yuan Tong Bao was written in character on the coin currency circulated all throughout China beginning on the Tang dynasty. <span>Kai Yuan Tong Bao's size, weight and the accordance of name with the form made it not only the main currency of the Tang Dynasty but also the norm of the coin in the next dynasties</span>.
Since it was minted during the Tang dynasty, it was used without discontinuity. Its usage even extended to the collapse of the Tang dynasty. This form of money was used for 1300 years before replaced by Hong Xian Tong Bao.
