This is the total value of goods produced and services provided in one year.
The Great Wall of China was built to protect China from its enemies and invaders from the North, especially the Mongols (Mongols were a tribal group that would regularly conduct raids into China) the Great Wall of China was built in the 7th century BC and is located in Huairou District, China! Hope this helps
The answer is A.....................................................................
The majority comes from the ocean, while a small percentage comes from trees