Answer:
B. four-crop rotations
Explanation:
the four-crop rotations was invented in the 18th century which means from January 1, 1701 to December 31, 1800. (1700s).
Answer: Because more and more agriculture is one of the main "professions", where the use of water is extremely essential. Therefore, there is a great demand for it due to the scarcity that it has been having, since this is a renewable medium.
Explanation:
71 million years ago. Hope it helps :)
