The types of organisms can be animals such as otters, birds, oysters, fish, crabs.
The main reason for the wall's construction had always been defense. Since China's first dynasty, the empire faced a near-constant threat of attack from the nomadic tribes to the north. This included those famed Mongols as well as lesser-known groups like the Xiongnu and the Göktürks.
Uptill 1900's Wales used to depend on major industries such as heavy industry, mining and activities on port of Cardiff. It was the Royal Mint that led to the development of service based finance industry in 1968. As such there were majorly three main industries : manufacturing, Financial Services and education industry and then by health and social service and wholesale and retail trade that helped the economy of wales in improving.
