Answer:
economy.
Explanation:
In 133 BC, the turmoil within Rome's economy proved dangerous for the Republic's stability.
With the growing economy of Rome, the gap between the rich and poor of Rome grew. With this growing gap, grew tension and turmoil within Rome. At that time stood two brothers, Tiberius and Gaius Gracchus, to stand for poor farmers of Rome, but were killed. This growing tension in the economy provoked slave revolts and military precipitation in Rome which resulted in the Fall of the Republic.
Production of more food--the system allowed for more food to be produced which fed the workers in an industrial economy.
The 'four-field system' rotates crops between the 4 fields no longer needing to keep one empty because one of the crops would replenish the field with nutrients while the others take nutrients away from the fields. <span />
The answers are a. for #45 and c. for #46
