That would be the year 74a.d.
They stopped farming and growing crops on one location and started growing and farming crops at another location. This enabled the soil to recuperate and gain the required minerals which makes good soil also fertile
The answer to the is Great<span> Britain and USA</span>
The correct answer is letter C.
Explanation: A simple and inexpensive way to improve soil fertility is by installing green manure or mulching, which adds organic materials and nitrogen to the soil, increases biological activity and recovers leached (washed) nutrients to the deepest layers.