In order to ensure that they had the water they needed for their farms, the Inca built large canal systems to irrigate, or bring water to, their fields. The canals also brought water to the cities. Many streets had supplies of fresh water running through a canal.
Do you have answer choices?
Answer:
1. Invasions by Barbarian tribes. The most straightforward theory for Western Rome's collapse pins the fall on a string of military losses sustained against outside forces. Rome had tangled with Germanic tribes for centuries, but by the 300s “barbarian” groups like the Goths had encroached beyond the Empire's borders.
Explanation:
Maintaining an army to defend the border of the Empire from barbarian attacks was a constant drain on the government. Military spending left few resources for other vital activities, such as providing public housing and maintaining quality roads and aqueducts. Frustrated Romans lost their desire to defend the Empire.
The answer is (B) hydroelectricity
