Which of the following did NOT contribute to the Maya collapse?

Human sacrifice was the greatest concern and dictated all the activities of the average Aztec person.

A palynologist would interpret a decrease in tree pollen, and an increase in grass pollen after the introduction of farming to an area as:

You are an archaeologist on a team excavating an ancient site.  You find evidence of elite and commoner classes, large public buildings, and a group of people who earned their living making pottery.  This evidence suggests the site was_________.

Native American cultures in the New World almost never had negative effects on their environments.

The centers of Maya cities usually included:

What subsistence technology helped Aztec people to flourish?

The most prevalent theory on the ‘Chaco phenomenon’ is that

According to your lectures, Uruk, located in Mesopotamia, was the very first city in the world. 

A preexisting civil war among the Inka made things much easier for the Spanish conquerors.