The answer is 2. The fact that mechanized agriculture has replaced manual labor. Hope this helps :)
330 million, 500 million, 20K meters squated, dont get the last 2.
Answer:
It would be phytoplankton.
Answer:
The Great Wall of China (traditional Chinese: 萬里長城; simplified Chinese: 万里长城; pinyin: Wànlǐ Chángchéng) is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe.
Explanation:
