2 things. It must have been centralized because that level of technology requires organization and specialization, so part of the population works in agriculture and the rest is free to research and discover things. The second thing is that it means they were very powerful because these great buildings were not civilian dwellings. The rulers must have had the intimidation to convince the population to pour so much work into construction, often using religion to justify their positions in power.
Answer is Retrograde motion
Most of the time planet moves in expected path near the ecliptic which is east to west. Some times each planet turns around and moves to the east for a period of time, then it turns around to head in west direction again making a loop or zig-zag against the star background. This is called retrograde motion. Thus retrograde motion is the change of direction of the planets in loop.
Overgrazing, overcropping, deforestation
I say true. People would then have to look at the same things over and over agin with nothing new.
A Tweet From D. Trump Would Be Primary
